Eastern Warbling Vireo
Eastern Warbling Vireo
Vireo gilvus
At a Glance
Rather plain, but with a cheery warbled song, the Eastern Warbling Vireo is a common summer bird in leafy groves and open woods. A persistent singer, it continues to deliver its melodious song even on hot summer days when most birds have fallen silent. Because it avoids solid tracts of mature, unbroken forest, it is probably more common and widespread today than it was when the Pilgrims landed. Until 2025, this bird and the Western Warbling Vireo were considered a single species. The differences between them are very subtle, and the safest way to tell them apart is by range.
All bird guide text and rangemaps adapted from Lives of North American Birds by Kenn Kaufman© 1996, used by permission of Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Category
Perching Birds, Vireos
IUCN Status
Least Concern
Habitat
Forests and Woodlands, Shrublands, Savannas, and Thickets
Region
Eastern Canada, Florida, Great Lakes, Mid Atlantic, New England, Plains, Southeast, Texas
Behavior
Direct Flight, Flitter, Rapid Wingbeats
Population
53.000.000
Range & Identification
Migration & Range Maps
The Eastern Warbling Vireo migrates mostly at night. Most travel north and south via Texas and Mexico, rather than flying across the Gulf, to and from wintering grounds in southern Mexico and Central America.
Description
Sexes similar — Length: 4.7–5.9 in (12–15 cm); wingspan: data unavailable; weight: 0.4–0.6 oz (12–16 g). The Eastern Warbling Vireo is gray and white, with yellow and olive tinges when in fresh plumage. It has no wing-bars, giving the wings a plain look. On this species, a white eyebrow is obvious, but a darker line through the eye is faint, so the dark eye is conspicuous on a pale face. The Western Warbling Vireo is almost identical but tends to have a slightly thinner and darker bill, a longer white eyebrow, and a darker crown. The songs of the two species differ slightly. Also see Philadelphia Vireo and Tennessee Warbler.
Size
About the size of a Sparrow
Color
Black, Gray, White, Yellow
Wing Shape
Rounded
Tail Shape
Notched, Square-tipped
Songs and Calls
The Eastern Warbling Vireo's song is a drowsy, rambling warble that ends on a rising note. The song of the Western Warbling Vireo tends to be slightly shorter, with more rough or burry notes, and usually doesn’t end on a rising note.
Call Pattern
Falling, Flat, Undulating
Call Type
Buzz, Chirp/Chip, High, Scream, Whistle
Habitat
Deciduous and mixed woods, aspen groves, poplars, shade trees. The Eastern Warbling Vireo breeds in open deciduous or mixed woodland, also in orchards, and shade trees of towns. Avoids unbroken mature forest and is often found in isolated groves near water. Winters in the tropics in open woods.
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Behavior
Eggs
4, sometimes 1- 5. White with brown or black specks. Incubation is by both parents, 12-14 days. The male Eastern Warbling Vireo frequently sings from the nest while incubating. Commonly parasitized by Brown-headed Cowbirds.
Young
Nestling Eastern Warbling Vireos are fed and brooded by both parents, and leave the nest 12-16 days after hatching.
Feeding Behavior
Forages mostly in deciduous trees, sometimes in shrubs, hopping along twigs and searching for insects among the leaves. The Eastern Warbling Vireo also picks insects off the undersides of leaves while hovering briefly.
Diet
Mostly insects, some berries. In breeding season, the Eastern Warbling Vireo feeds mainly on insects, including many caterpillars, plus aphids, beetles, grasshoppers, ants, bugs, scale insects, flies, and dragonflies. It also eats some spiders and snails. Takes berries and small fruit from bunchberry, dogwood, pokeweed, sumac, elderberry, poison oak, and many other plants, especially in late summer and fall.
Nesting
Male defends territory by singing. In courtship, the male Eastern Warbling Vireo struts and hops around the female with his wings spread and tail fanned, usually not far from the potential nest site. Nest is generally in a deciduous tree or shrub, often placed high in a tree, up to 90 ft. Nest (built by both sexes) is a compact, deep cup, suspended by its rim from a forked twig. Nest made of bark strips, grass, leaves, and plant fibers.
Conservation
Conservation Status
Since it favors open woods and edges, it probably increased in some areas initially due to the clearing and fragmentation of the forest. Now common and widespread.
Climate Threats Facing the Eastern Warbling Vireo
Choose a temperature scenario below to see which threats will affect this species as warming increases. The same climate change-driven threats that put birds at risk will affect other wildlife and people, too.
