Merlin

Virginia's Warbler Life History

Habitat

Habitat Open Woodlands

Virginia's Warblers breed in open pinyon-juniper and oak woodlands often on steep slopes with shrubby ravines throughout most of their range. They also use dense thickets of mountain mahogany in southern Idaho and mixed-evergreen forests on the Mogollon Rim in Arizona. During migration, they tend to gravitate toward pine forests and scrubby or wooded areas adjacent to creeks. On the wintering grounds in Mexico they stick to thorn scrub and tropical deciduous forests.

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Food

Food Insects

Virginia's Warblers pick insects from deciduous vegetation such as oaks, bigtooth maple, and New Mexico locust. Their diet consists primarily of caterpillars, spiders, ants, weevils, stinkbugs, and flying insects, but they may take nectar from flowering plants on occasion.

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Nesting

Nest Placement

Nest Ground

Males and females inspect potential nest sites together. They typically select a spot on the ground beneath a root or rock, or at the base of clumps of grass, oaks, or New Mexico locusts to provide concealment. They frequently nest on a steep slope, placing the nest on the downslope side of a clump of vegetation.

Nest Description

The female collects grasses and other plant material from the ground to build a cup-shaped nest that she lines with fine grasses and hairs.

Nesting Facts
Clutch Size:3-5 eggs
Number of Broods:1 brood
Egg Length:0.6-0.7 in (1.5-1.7 cm)
Egg Width:0.5-0.5 in (1.2-1.3 cm)
Incubation Period:11-14 days
Nestling Period:10-14 days
Egg Description:

Cream-colored with tiny brown spots.

Condition at Hatching:

Mostly naked with a bit of grayish down along the back and head.

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Behavior

Behavior Foliage Gleaner

Virginia's Warblers tend to forage in the middle levels of pinyon-juniper forests and nest on the ground. They frequently wag their tails up and down as they hop from twig to twig looking for insects. Males defend their breeding territories with song, singing from an exposed branch at the top of a tree or shrub. Most individuals likely form monogamous bonds for a single breeding season only, but some males may mate with a second female in the same season. Virginia's Warblers tend to occur in pairs on the breeding grounds, but form mixed-species flocks with other warblers such as Orange-crowned and Black-throated Gray Warblers during migration and on the wintering grounds.

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Conservation

Conservation Restricted Range

Virginia's Warblers are uncommon and their numbers declined by 46% between 1970 and 2014, according to Partners in Flight. They are a Yellow Watch List species with a restricted range, and have a Continental Concern Score of 14 out of 20. Partners in Flight estimates that if current rates of decline continue, Virginia's Warblers will lose another half of their remaining population within the next 61 years. The current estimated global breeding population is 950,000. The causes for decline in Virginia's Warblers are not well understood. In some areas forest management techniques such as controlled burning can reduce available breeding habitat. In other areas where Brown-headed Cowbirds are abundant, cowbirds frequently lay eggs in the nests of Virginia's Warblers, preventing the warblers from raising offspring of their own. Climate change may also affect these birds as they frequently associate with wet drainages, which may shrink as climate warms.

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Backyard Tips

Virginia's Warblers don't visit feeders but they might come to backyards within their range to forage on insects in your trees and shrubs. Learn more about how you can provide habitat in your yard for warblers and other wildlife at Habitat Network.

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Credits

Dunne, P. (2006). Pete Dunne's essential field guide companion. Houghton Mifflin Harcourt, New York, USA.

Lutmerding, J. A. and A. S. Love (2016). Longevity records of North American birds. Version 2016.1. Patuxent Wildlife Research Center, Bird Banding Laboratory, Laurel, MD, USA.

Olson, Christopher R. and Thomas E. Martin. (1999). Virginia's Warbler (Oreothlypis virginiae), version 2.0. In The Birds of North America (P. G. Rodewald, editor). Cornell Lab of Ornithology, Ithaca, New York, USA.

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

Sauer, J. R., D. K. Niven, J. E. Hines, D. J. Ziolkowski Jr., K. L. Pardieck, J. E. Fallon, and W. A. Link (2017). The North American Breeding Bird Survey, Results and Analysis 1966–2015. Version 2.07.2017. USGS Patuxent Wildlife Research Center, Laurel, MD, USA.

Sibley, D. A. (2014). The Sibley Guide to Birds, second edition. Alfred A. Knopf, New York, USA.

Stephenson, T. and S. Whittle (2013). The Warbler Guide. Princeton University Press, New Jersey, USA.

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