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Biology Articles/Videos
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Living Bird Magazine Endangered Willow Flycatchers in San Diego Are Adapting to Climate Change
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Living Bird Magazine Who Wins at the Bird Feeder—the Lone Wolf or the Social Butterfly?
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Living Bird Magazine To Catch Voles Under the Snow, Great Gray Owls Must Overcome an Acoustic Mirage
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Living Bird Magazine Geomagnetic Disturbances and Wrong-Way Bird Migrations
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eBird How Do Scientists Use eBird Data?
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Living Bird Magazine What Is the Essence of Iridescence? Ask a Hummingbird
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Against a Backdrop of Bird Declines, Complex Problems Meet Creative Solutions
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Living Bird Magazine How Do Cooper’s and Sharp-shinned Hawks Coexist in Backyards? FeederWatch Investigates
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BirdCast When Will Spring Bird Migration Hit Its Peak? BirdCast Has Answers
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Avian Influenza Outbreak 2022-2023: Should You Take Down Your Bird Feeders?
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Living Bird Magazine What's That Bird Song? Merlin Bird ID Can Tell You
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Living Bird Magazine Meet the "Tanabeak," an Extremely Rare Tanager–Grosbeak Hybrid
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Living Bird Magazine Can the Clark's Nutcracker Help Its BFF, the Whitebark Pine, Recover from Disaster?
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State of the Birds Report 2022
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Advances in Window Safety Come to the Cornell Lab and Cornell Campus
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Living Bird Magazine In a Hopeful First, American Crows Survive West Nile Virus
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Living Bird Magazine New BirdCast Dashboard Spotlights the Hottest States and Counties for Bird Migration
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Living Bird Magazine For Unusual Birds, Does Distinction Raise the Risk of Extinction?
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BirdCast How to Use BirdCast Dashboard to See Your Local Migration in Detail
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Living Bird Magazine Hairy Woodpeckers Use Body Language to Show Who's Boss
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Living Bird Magazine Sounds Like Home: Experimenting with Audio to Help Marbled Murrelets Find Prime Habitat
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Living Bird Magazine Tracking 3 Jaeger Species Across 4 Oceans—and Into a Comic Book
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BirdCast Birdcast: Bird migration forecasts in real-time
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The Basics of Bird Migration: How, Why, and Where
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Living Bird Magazine Analysis: How Did the Tree of Life Grow Its Branches?
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By Shuffling Genes, a Songbird Takes a Shortcut to Speciation
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Living Bird Magazine Where Do Migrants Go in Winter? New Models Provide Exquisite Detail
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Living Bird Magazine Analysis: A New Vision for Restoring Warbler Wintering Habitat
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Living Bird Magazine The Coolest Hummingbird, as Measured by an Actual Thermometer
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Living Bird Magazine A City Gets Quieter in 2020, and White-crowned Sparrows Change Their Tune
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Living Bird Magazine Photo Essay: The Fragile Forest Home of the Birds-of-Paradise
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Living Bird Magazine Do Birds Have Eyelashes?
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Sound Sleuthing: Listen to These Two Tapaculo Songs
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Sound Sleuthing: Listen to Eastern and Western Chipping Sparrows
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Sound Sleuthing: Listen to These Rufous Antpitta Songs
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Living Bird Magazine Sound Sleuthing: Discovering New Bird Species by Listening for Them
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Living Bird Magazine The White-throated Sparrow Song That's Taking Over North America
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Living Bird Magazine A Bird’s Beak Is Shaped by More Than What it Eats
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Living Bird Magazine The Most Mysterious Feather: Filoplumes
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How Do Birds "Fall in Love"? A Look at Courtship Displays
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NestWatch What’s All The Buzzing About: Do Flicker Nestling Vocalizations Mimic Bees?
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Living Bird Magazine Do Birds Dream?
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Living Bird Magazine Scientists ID why Gouldian Finches Have Red, Black, or Yellow Heads
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Living Bird Magazine The Forgotten Female: How a Generation of Women Scientists Changed Our View of Evolution
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Living Bird Magazine In Africa, Sociable Weavers Build a Nest of Many Uses
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Macaulay Library Recordings Help Unravel the Mystery of Mixed-Species Flock Leadership
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Evolutionary Biology Why Evolution Goes Wild on Islands: The Science of Adaptive Radiation
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Living Bird Magazine View from Sapsucker Woods: Grinnell's Mantra Rings True on a Peruvian Mountain
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Living Bird Magazine Escalator to Extinction Carries Species Off the Top of a Mountain
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Living Bird Magazine How Do Birds Survive the Winter?
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Living Bird Magazine Female Birds-of-Paradise Go For Complex Males
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eBird eBird Status and Trends
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Robots, Telemetry, and the Sex Lives of Wild Birds [video]
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eBird Evening Grosbeak Call Types of North America
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Living Bird Magazine Add Flair to Your Life List By Tracking Down Evolution's Most Distinctive Birds
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Living Bird Magazine Fantastic Journeys: Shorebirds Are Next-Level Athletes
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NestWatch On Cowbirds and Changelings: is there more to the lore?
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Macaulay Library Many Female Birds Sing Beautiful Songs—All We Have To Do Is Listen
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Bird Population Studies House Finches with Pink Eye Reveal Secrets of Disease Virulence
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Project FeederWatch When 136 Bird Species Show Up at a Feeder, Which One Wins?
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Laysan Albatrosses Survived the Feather Trade, Industrial Fishing, and Plastics. What's Next?
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eBird Crossbills of North America and Red Crossbill Call Types
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Project FeederWatch Who Is the Toughest Bird in Your Backyard?
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Project FeederWatch Curiosity Killed the Cat, But Not the Corvid: Steller's Jay's Foraging Strategies
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That Asteroid That Killed the Dinosaurs? It May Have Sped Up Bird Evolution
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Living Bird Magazine The Beauty and Biology of Egg Color
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Living Bird Magazine Two Tips for Telling a Bird's Age by Its Molt Patterns
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Living Bird Magazine Why Can Some Birds Drink Salty Seawater?
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Evolutionary Biology How Can 9 Species Look So Different Yet Be Genetically Almost Identical?
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Bird Cams Questions About Nesting Birds? Live from a Robin's Nest, We've Got Answers
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Living Bird Magazine The Evolution of Bird Migration
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In a Flashy Species, Drab Young Males Find Their Own Route to Success With Females
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Bird Population Studies Flying on Fumes: How Birds Meet Their Oxygen Demands at High Altitude
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K–12 Education Extinct Birds Can Teach Students Key Science Concepts
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Living Bird Magazine Insects in Summer, Honeydew in Winter: Migrant Birds Change Tastes With the Seasons
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Living Bird Magazine How Do Gulls Deal With Cold Feet?
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Bird Academy Birds of the Yellow Sea
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Scans Reveal Birds Use Their Beaks as Air Conditioners
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Female Lyrebirds Step Into the Spotlight With Their Extraordinary Mimicry
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Living Bird Magazine Spruce-Woods Warblers Revisited: 60 Years Later, the Cast of Characters Has Changed
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Living Bird Magazine A Noble Vision of Gulls
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Why Fly With Extra Weight? Migrating Warblers Use Leftover Fat to Fuel Breeding Season
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Macaulay Library Baby Birds Learn Calls From Their Mothers While Still in the Egg
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Project FeederWatch Hummingbirds With Raptor Neighbors Have More Nest Success
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Conservation Science Blue-winged Teal: Animated Abundance Map from State of North America's Birds 2016
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Project FeederWatch Bird Feeder Behavior Project: Find Out Who is Interacting with Whom
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Where Is That Bird Going With That Seed? It's Caching Food for Later
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Bird Academy From So Simple a Beginning: The Wall of Birds
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Living Bird Magazine The Dilemma of Conservation Reliance: When a Species Needs Help Indefinitely
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Project FeederWatch Will Sing for Food: Well Fed Birds Sing More During the Dawn Chorus
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Bird Academy Explore the Diversity and Evolution of Birds with the Wall of Birds Interactive
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Project FeederWatch “Anting” Behavior in Blue Jays
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Bird Academy Built to Peck: How Woodpeckers Avoid Brain Injury
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Macaulay Library Fairywrens Sing to Deter Cheating Mates
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Bird Population Studies Why Global Climate Change May Be Putting More Birds in the Same Basket
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Project FeederWatch Tell us About Bird Behavior at Your Feeder
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Students For Tropical Wren, Songs and Species Evolve in Isolation
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Living Bird Magazine The View from Sapsucker Woods: The Paris Climate Agreement
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Living Bird Magazine Look out! The Backyard Bird Alarm Call Network
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Project FeederWatch Understanding the Migratory and Irruptive Movements of Crossbills
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eBird Mesmerizing Migration Map: Which Species Is Which?
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eBird Mesmerizing Migration: Watch 118 Bird Species Migrate Across a Map of the Western Hemisphere
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The Almost Impossible Task of Filming Songbirds in Flight
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Project FeederWatch Chilly Air and Warm Hearts: Chickadee Winter Romance
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Bird Academy All About Bird Anatomy
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Project FeederWatch Ruby-throated Hummingbird's Winter Range Moves Northward
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Project FeederWatch What Do Birds Do With All the Seeds They Take From Feeders?
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What Is Taxonomic Order and Why Is It Used for the Sequence of Birds in My Field Guide?
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Project FeederWatch Halloween Special: Titmouse Behavior is Affected by Face Masks
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Bird Academy How Hunters and Artists Helped Save North America's Waterfowl: The Duck Stamp Success Story
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eBird When Does a Songbird Migrate? Depends on What It Eats
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Bird Academy Clark’s Nutcrackers and the Trees They Depend On
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Bird Academy How Birds Make Colorful Feathers
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Living Bird Magazine North of the Treeline: The Hardy Lives of Arctic-Breeding Birds
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Birds-of-Paradise Project Birds-of-Paradise Project—Full Website
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Bird Academy Bird Plumage Variations and Abnormalities
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Sounding Out the Dawn Chorus of Banded Wrens in Costa Rica
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Bird Academy Seabird Success Story
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Bird Academy Research update: New chickadee study shows climate change affecting distribution
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Birds-of-Paradise Project Black Sicklebill: The Thin Blue Line
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Living Bird Magazine Like Chasing Tornadoes: the Fun and Challenge of Mixed Species Flocks
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NestWatch The 9 Parts of a Bird's Nesting Cycle
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Project FeederWatch Northern Cardinals know how to shake their tail feathers
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Bird Academy Cliff Swallows Build Nests From Mud
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Vogelkop Bowerbird Decorates His Bower With Flowers
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Black Skimmer Chicks Beg For Food With a Humorous Pose
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Bird Academy Bald Eagles and Crows Eat Fish on an Alaska Beach
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Bird Academy Learn to Identify the Distinctive Calls of Owls
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Bird Academy Superb Lyrebird Might Be the Fanciest Bird in the World
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Project FeederWatch Wintering Sparrows Balance Safety of Brush Piles Against Warmth of Sun
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Project FeederWatch How do Western Bluebirds recognize their relatives?
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Project FeederWatch A dominant species in many arenas: the 12 gram Black-capped Chickadee
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Living Bird Magazine Migrants Ride a Green Wave North
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Evolutionary Biology From Many, One: How Many Species of Redpolls Are There?
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Project FeederWatch Chipping Sparrows help each other out with territory defense… sometimes
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Power Struggles Are Playing Out at Your Feeder—Here's What to Look For
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Birds-of-Paradise Project Bird-of-Paradise Spreads His Feather Skirt and Dances
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Northern Mockingbird Sings Hundreds of Borrowed Songs
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Iridescence Revealed in the Feathers of an Anna’s Hummingbird
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Bird Academy Fanciness Lost: How Evolution Sometimes Leads to Simplicity
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Bird Academy On a Sage-Grouse Lek: A Video Exploration Into Wild Behavior
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Top 5 Interesting Nests in North America
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Bird Academy A Fancy Experiment with Australia's Red-backed Fairywrens
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Bird Academy Fancy Males & Choosy Females
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Bird Academy How Fanciness Evolves
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Bird Academy Ways To Be Fancy
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Bird Academy Fancy Males
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Bird Academy All About Fancy Males
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Four Nuthatches, Four Ways to Make It Through a Cold Winter
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Living Bird Magazine Splitting Feathers: One Backyard Hummingbird Species Becomes Two
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Life in an Adelie Penguin Colony—Live From Antarctica [videos]
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The New Birds of Winter
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The Redpolls are Coming! The Redpolls are Coming! (And Siskins, Too)
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Project FeederWatch Coping with Cold: A Bird’s Strategy
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How to Recognize Duck Courtship Displays
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A Snowy Owl Sequel?
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Project FeederWatch Cooperative Breeding? In My Backyard?
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Project FeederWatch The colors on backyard birds may mean more than we think
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How Do Tired Birds Choose Where to Stop During Migration?
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Evolutionary Biology New Cotinga Tree of Life Sheds Light on Evolution of Brilliant Colors
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Western Bluebirds Sing Like Their Neighbors, Not Necessarily Like Their Family
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Hawaii’s Birds: Past, Present and Future [video]
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BirdCast Eight Intriguing Migration Mysteries Solved With BirdCast and eBird
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Bird Population Studies Migrating Northern Wheatears Go the Distance—and Pack Accordingly
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eBird Take the Long Way Home: "Green Wave" Explains Bird Migration Routes
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Brilliant Flash: Red-winged Blackbird Territorial Displays
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Why Chickadees Grab Seeds and Go: Feeder Bird Strategies
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Bird Academy Caw vs. Croak: Inside the Calls of Crows and Ravens
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Bird Academy For Teachers: Bird Academy Sound Lessons
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Bird Academy For Teachers: Bird Song Visualized Slides
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Bird Academy For Teachers: Anatomy of Bird Song Slides
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Bird Academy Meet a Feather Scientist and Unravel the Mystery of Wings That Sing
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Bird Academy All About Bird Song
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Bird Academy Birds Got Swing: A Musical Experiment
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Maybe Birds Can Have It All: Dazzling Colors and Pretty Songs, Too
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The Top 10 Most Amazing Looking and Sounding Tanagers (as Determined by Science!)
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Learn How to Bird by Ear With Our Bird Song Hero Game
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Bird Academy All About Feathers
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Bird Academy Feather Biology Slides for Download
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Bird Academy Everything You Need to Know About Bird Song
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Bird Academy Everything You Need to Know About Feathers
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Bird Academy Bird Song Hero
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Built to Sing: The Syrinx of the Northern Cardinal
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Humpback Whales: Composers of the Sea [video]
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Flyways for Flyweights: Small Birds Capitalize on Weather Patterns During Epic Migrations
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Bird Academy Bird Academy
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To Know the Crow: Insights and Stories From a Quarter-Century of Crow Study [Video]
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Living Bird Magazine 50 Years Later, Climate Has Pushed New Guinea's Birds Up and Off Mountains
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Living Bird Magazine View From Sapsucker Woods: Pushed to the Top by Climate Change
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Bird Academy Explore Feathers With New, Free Resources From Bird Academy
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eBird When Will Yellow Warblers Return? Check Our Animated Map
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Celebrate Urban Birds Focal Species Close-Up: Brown-headed Cowbirds
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Evolutionary Biology Warming Temperatures Are Pushing Two Chickadee Species—and Their Hybrids—Northward
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Social Selection and the Evolution of Ornaments [video]
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A First for the Atlantic Forest: Radio-Tracking the Helmeted Woodpecker
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Climate Change Pushing Tropical Birds Up the Mountain…and Off
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Chat With Antarctic Scientists and Watch Their Penguin Cam [Video]
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Bird Cams How Birds Survive the Cold: Feathers + Food = Warmth
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Snowy Owl vs. Peregrine Falcon
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Bird Population Studies Jumping the Species Barrier: Where Do Diseases Come From?
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Bird Population Studies How a House Finch Disease Reshaped What We Know About Epidemics
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Bird Academy Golden Eagle Flying Through Snow
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Bird Academy The Distinctive Calls of Owls: A Sampler
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Living Bird Magazine How Clark's Nutcrackers Find Buried Seeds Under a Blanket of Snow
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Living Bird Magazine Food vs. Safety: Risk Management for Chickadees
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Evolutionary Biology Infidelity in Australian Bird May Be the Secret Keeping a Species Together
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NestWatch Glossary of Nesting and Breeding Terms
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NestWatch Clutch Size and Nest Timing Stats for Common Species
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NestWatch Identifying Nests and Eggs
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NestWatch How to Find Nests
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NestWatch Brown-headed Cowbirds and Brood Parasitism
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NestWatch Common Nesting Birds
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Students Flamingos are Algae Vacuums, Really
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Bird Academy Tracking Epic Migrations: Tools of the Wildlife Biologist
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Bird Academy Spying on Flamingos: Tools of the Wildlife Biologist
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Bird Academy Protecting Flamingos in the Andes
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Bird Academy Nutcrackers, Whitebark Pines, and Climate Change
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Bird Population Studies Bird Songs Altered by PCB Contamination, Study Finds
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Birds in the Ecology of Alaska’s Yukon Delta
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Bird Academy Peek at Night Birds While Hearing Their Nocturnal Calls
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Macaulay Library Listen to the Winners From Studio 360's Birdsong-Into-Music Challenge
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Bird Academy On a Lek with Gunnison Sage-Grouse
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Bird Cams Big Red Lays Her First Egg of 2013
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Thump!: The Ruffed Grouse Mate Attraction Display
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Weighing the Fate of the Gunnison Sage-Grouse
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NestWatch Why So Red, Mr. Cardinal? NestWatch Explains
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How Do Starling Flocks Create Those Mesmerizing Murmurations?
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Bird Cams Great Horned Owl Twilight Visit to Sapsucker Woods Heron Nest
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Bird Cams Two Ruffed Grouse Visit the Ontario FeederWatch Cam
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Bird Academy Boreal Owl Hunting in Daylight
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Birds-of-Paradise Project Listen to the Many Sounds of New Guinea's Birds-of-Paradise
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Birds-of-Paradise Project The Nonvocal Sounds of the Sicklebill and Riflebird Birds-of-Paradise
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Birds-of-Paradise Project Types of Paradise: What Is an Astrapia, Parotia, Riflebird, or Sicklebill?
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Birds-of-Paradise Project How Feathers Evolved Into Giant Head Wires in the King-of-Saxony Bird-of-Paradise
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Birds-of-Paradise Project King-of-Saxony Otherworldly Calls
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Birds-of-Paradise Project Meet the 39 Species of Birds-of-Paradise
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Birds-of-Paradise Project Extreme Choosiness: the Many Phases of Courtship for a Greater Bird-of-Paradise
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Birds-of-Paradise Project The Surprising Secret of the Twelve-wired Bird-of-Paradise's Strange Feathers
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Birds-of-Paradise Project Inspection & Touch: and the Birds-of-Paradise
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Birds-of-Paradise Project For Birds-of-Paradise, Life’s a Stage
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Birds-of-Paradise Project Carola’s Parotia: King of the Dance
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Birds-of-Paradise Project Paradise Riflebirds Need a Lot of Practice to Learn Their Display Dance
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Birds-of-Paradise Project This Riflebird's Courtship Display Requires Fluid Coordination
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Birds-of-Paradise Project Dance: and the Birds-of-Paradise
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Birds-of-Paradise Project How Geographic Isolation Turned New Guinea Into an Evolutionary Workshop
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Birds-of-Paradise Project The Ballerina Dance of the Carola's Parotia Bird-of-Paradise
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Birds-of-Paradise Project Superb Bird-of-Paradise: Psychedelic Smiley Face
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Birds-of-Paradise Project Seven Steps to Understanding the Evolutionary Power of Female Choice
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Birds-of-Paradise Project Shape Shifting: and the Birds-of-Paradise
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Birds-of-Paradise Project Taking a Closer Look: Inspection & Touch as Part of Courtship
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Birds-of-Paradise Project Birds-of-Paradise That Can Change Shape Right Before Your Eyes
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Birds-of-Paradise Project Explore the Marvelous, Sometimes Ridiculous Feathers of the Birds-of-Paradise
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Birds-of-Paradise Project Ribbon-tailed Astrapia: The Three-Foot Tail
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Birds-of-Paradise Project Explore the Many Shades and Types of Color in the Birds-of-Paradise
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Birds-of-Paradise Project Feathers: and the Birds-of-Paradise
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Birds-of-Paradise Project Wilson’s Bird-of-Paradise Displays the Full Spectrum of Colors
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Birds-of-Paradise Project Magnificent Riflebird: Directional Color
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Birds-of-Paradise Project Iridescence in the Ribbon-tailed Astrapia Bird-of-Paradise
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Birds-of-Paradise Project Color: and the Birds-of-Paradise
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Birds-of-Paradise Project Curl-crested Manucode: Unusual Anatomy
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Birds-of-Paradise Project Sound and the Birds-of-Paradise
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Birds-of-Paradise Project Speciation: An Illustrated Introduction
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Birds-of-Paradise Project Natural & Sexual Selection: An Illustrated Introduction
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Birds-of-Paradise Project A Gorgeous Video Introduction to the Birds-of-Paradise Project
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Living Bird Magazine Inside the Massive Winter Irruptions Known as Superflights
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Living Bird Magazine A Crow-Shaped Hole in Hawaii
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eBird North American Red Crossbill Types: Status and Flight Call Identification
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Courses Bird Behavior Online Course: Courtship and Rivalry (Preview)
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Spoon-billed Sandpiper: Breeding Season
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Bird Academy The Cutest Sandpiper? Watch Baby Spoon-billed Sandpipers Hatch
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Bird Academy Spoon-billed Sandpiper: Foraging
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Bird Academy Spoon-billed Sandpiper: Courtship
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Bird Academy Loud and Goofy: Long-tailed Duck Territorial Calls
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Comic Relief: Willow Ptarmigan Territorial Calls
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Celebrate Urban Birds How Do Birds Prepare for Migration?
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Students House Music: Investigating the Vocal Acrobatics of the House Wren
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New Book Tackles Old Question: Competition Between Bird Species
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How Yellow-billed Loons Survive in the Arctic
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Humble Origins: When a Cry for Help Becomes a Song-and-Dance Number
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Students Clark's Nutcrackers Find Whitebark Pine Decline a Tough Nut to Crack
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How a Parrot Learns Its Name in the Wild
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Spoon-billed Sandpipers: Pairing and Parenthood on the Tundra
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Students Fire Ants Attack Herring Gulls on Maine Island
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Bird Population Studies Acorn Woodpeckers Help Each Other in Times of Plenty
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Biomimicry: Copying our way to conservation [Video]
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eBird Understanding Birds & Weather: Fall Birding Basics
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Science at work: How many kinds of Red Crossbills are there, anyway?
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Surprise! Sandpiper chicks emerge from the Russian lichens
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Bird Population Studies Study: How the Amount of Daylight Affects Incubation Length
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Bird-Friendly Benefits of Shrubby Areas and Tangles
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Water Friendly Tips for Pavement and Gravel
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Bird-Friendly Tips for Brush Piles
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Storing Food: The Granaries of Acorn Woodpeckers
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NestWatch NestWatch Looks at the (Citizen) Science in a Few Proverbs
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Conservation Science Birds Are Less Abundant When Periodic Cicadas Emerge
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Conservation Science Rats! A Menace for Bicknell's Thrushes
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Conservation Science A Rosetta Stone for Identifying Warblers' Migration Calls
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Shorebird Foraging Strategies
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Birds in the Ecology of the Mississippi River Delta
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Foraging and Flocking: The Black-necked Stilt
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Project FeederWatch What Are Feeder Birds Doing With All Those Seeds? Hi-Tech Tools Find Out
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Bird Academy Restoring America’s Delta
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Project FeederWatch Do Siskins Move in Straight Lines?
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Finding Plovers on a Vanishing Beach in the Gulf of Mexico
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What Oil Spills do to Birds
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Bird Academy Voices of the Arctic Spring: Semipalmated Sandpiper
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Macaulay Library Zoom!: The Aerial Display of the Common Nighthawk
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Macaulay Library Inflatable Throat: Magnificent Frigatebird Mating Display
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Macaulay Library I’m Here, Where Are You?: Wails of the Common Loon
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An Expert Mimic: The Gray Catbird
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Bird Academy Real Angry Birds: Sharp-tailed Grouse Battle
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Bird Academy Voices: American Bittern
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White-winged Crossbill Foraging Adaptation
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Eastern Screech-Owl Camouflage
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Students Interpreting Red-winged Blackbird Behavior
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Wood Thrush Pair at Nest
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Bird Academy The Language of Birds
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Bird Academy Territorial Call of the American Bittern
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Bird Academy Keeping the Peace: Threat Signals in Gull Colonies
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Macaulay Library Voices: Barred Owl
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Bird Academy Meet the Scientists: Mari Kimura & Investigating Avian Malaria
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Bird Academy Massive Noisy Flocks: Snow Goose Migration
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Students Coordinated Cooperation: A Feeding Strategy that Reduces Nestling Competition
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Students When Females Dress Up: Cooperative Breeding Impact on Plumage
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Sons vs. Daughters in Cooperative Breeding Species
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Students Shared Dynasties Among Acorn Woodpeckers
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Students The Importance of Family for Western Bluebirds
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Celebrate Urban Birds From Sounds to Sight (Learning Activity)
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For Tropical Bird, Violin More Resonant Than Aria
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Young Sparrows Learn by Eavesdropping
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In-Flight Albatross Cam Finds the Birds Feeding with Killer Whales
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Video: Rooks Use Rocks to Reach Reward
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Toucans Use Enormous Bills to Cool Off
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40-Year Study Shows Birds Feeling Climate Change Effects
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Remember me? Crows do
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The Basics: Feather Molt
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Living Bird Magazine Some Chickadees Are Bilingual—But Why?
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The Basics: How Birds Navigate When They Migrate