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    Scarlet Tanager Life History

    Habitat

    Habitat ForestsScarlet Tanagers breed in mature deciduous forests and mixed deciduous-coniferous forests in eastern North America. They nest in oak, pine-oak, oak-hickory, beech, hemlock-hardwood, and occasionally pure eastern hemlock forests. In Canada they sometimes extend into boreal forests in stands of aspen, balsam poplar, and birch. Breeding Scarlet Tanagers prefer large forest tracts with large trees. During spring and fall they use similar forest habitats as well as open spaces such as parks and gardens. When they arrive in the southern United States coast in early spring they feed in shrubby vegetation, grassy fields, and on the ground. Scarlet Tanagers winter in mature forests and forest edges in northern and western South America, mostly on hills and mountains. They range south as far as the Bolivian lowlands.Back to top

    Food

    Food InsectsScarlet Tanagers eat mainly insects along with some fruit and tender buds. Their invertebrate diet includes ants, sawflies, moths, butterflies, beetles, flies, cicadas, leafhoppers, spittlebugs, treehoppers, plant lice, scale insects, termites, grasshoppers, locusts, dragonflies, dobsonflies, snails, earthworms, and spiders. While searching for these tidbits they walk along branches high in the canopy or (rarely) along the ground, or vertically on tree trunks to probe the bark. Scarlet Tanagers perch or hover with fast wingbeats to grab insects from leaves, bark, and flowers, and they catch flying insects like bees, wasps, and hornets from the air. They swallow small larvae whole, but they kill larger prey by pressing it into a branch. In the winter, they forage in mixed-species flocks with woodcreepers, flycatchers, barbets, and tropical tanagers.Back to top

    Nesting

    Nest Placement

    Nest TreeThe female chooses the nest site, usually selecting a shaded spot within a cluster of leaves at a juncture of small branches. Nests are often fairly high (50 feet or more from the ground) on a nearly horizontal branch well away from the trunk. The site usually has an unobstructed view of the ground and open flyways from nearby trees. Scarlet Tanagers tend to nest in mature deciduous trees such as maple, beech, and oak, but they also nest in eastern hemlock.

    Nest Description

    The female gathers nesting material from the forest floor and builds a flimsy nest in 3–4 days, spending relatively little time on it each day. She drops material onto the nest, hops in, and molds it into shape by pressing her body against the sides and bottom, then getting out and weaving in loose ends. The nest is a loosely woven saucer of twigs, grasses, plant stalks, bark strips, rootlets, and pine needles. It has a shallow and asymmetrical interior space, lined with grass, fine rootlets, fine plant fibers, vine tendrils, and pine needles.

    Nesting Facts
    Clutch Size:3-5 eggs
    Number of Broods:1 brood
    Egg Length:0.8-1.1 in (2-2.7 cm)
    Egg Width:0.6-0.7 in (1.5-1.8 cm)
    Incubation Period:12-14 days
    Nestling Period:9-15 days
    Egg Description:Greenish blue to light blue speckled with chestnut, purplish red, and lilac.
    Condition at Hatching:Helpless, eyes closed, with orange skin and small tufts of grayish white down on the head and back.
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    Behavior

    Behavior Foliage GleanerScarlet Tanagers are strong fliers, making swift, direct flights and migrating long distances in fall and spring. Males arrive early on their breeding grounds to defend loose territories that include mating, nesting, and foraging areas. Territorial singing battles sometimes can escalate to confrontations, where one or both males spread and droop their wings and raise their tail in threat. If neither backs down, the standoff culminates in one male chasing another. Scarlet Tanagers are monogamous within each breeding season but switch mates from year to year. Parents feed their young for up to two weeks after the birds fledge, and then the family disperses before migrating. On wintering grounds Scarlet Tanagers join up with other species in foraging flocks.Back to top

    Conservation

    Conservation Low ConcernScarlet Tanager populations declined by about 14% between 1966 and 2014, according to the North American Breeding Bird Survey. Partners in Flight estimates a global breeding population of 2.2 million with 93% spending some part of the year in the U.S., and 7% breeding in Canada. The species rates an 11 out of 20 on the Continental Concern Score. Scarlet Tanager is not on the 2014 State of the Birds Watch List. These birds are interior forest species, so changes in land-use—fragmentation by development as well as regrowth as cleared land reverts to forest—may be responsible changes in population trends over time. In fragmented landscapes, nests are in greater danger of being parasitized by Brown-headed Cowbirds and from predators that operate along habitat edges. To safeguard the Scarlet Tanager population, researchers recommend preserving and restoring mature forest habitat for breeding, migrating, and wintering birds.Back to top

    Backyard Tips

    Scarlet Tanagers visit many kinds of berry plants, including blackberries, raspberries, huckleberries, juneberries, serviceberries, mulberries, strawberries, and chokeberries.

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    Credits

    Lutmerding, J. A. and A. S. Love. Longevity records of North American birds. Version 2015.2. Patuxent Wildlife Research Center, Bird Banding Laboratory 2015.

    Mowbray, Thomas B. 1999. Scarlet Tanager (Piranga olivacea), version 2.0. In The Birds of North America (P. G. Rodewald, editor). Cornell Lab of Ornithology, Ithaca, New York, USA.

    North American Bird Conservation Initiative. 2014. The State of the Birds 2014 Report. US Department of Interior, Washington, DC, USA.

    Partners in Flight. 2017. Avian Conservation Assessment Database. 2017.

    Sauer, J. R., J. E. Hines, J. E. Fallon, K. L. Pardieck, Jr. Ziolkowski, D. J. and W. A. Link. The North American Breeding Bird Survey, results and analysis 1966-2013 (Version 1.30.15). USGS Patuxtent Wildlife Research Center 2014b. Available from http://www.mbr-pwrc.usgs.gov/bbs/.

    Sibley, David Allen. 2014. The Sibley guide to birds, second edition. Alfred A Knopf, New York.

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