Guide to North American Birds

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Photo: Doug Wechsler/Vireo

Yellow-green Vireo

Vireo flavoviridis

This bird enters our area mainly as a rare summer visitor to southern Texas. It is a close relative of the Red-eyed Vireo, and at one time the two were considered to belong to the same species. Yellow-green Vireos nest mostly in tropical areas, from Mexico to Panama, where the climate would seem to be suitable for songbirds all year; despite this, they are strongly migratory, traveling south to the Amazon Basin for the winter.

Conservation status	Apparently always has been rare in Texas. In Mexico and Central America, widespread and common, but could be vulnerable to loss of habitat.
Family	Vireos
Habitat	Resaca woodlands, shade trees. In Texas, a rare nesting bird, usually in native woods near oxbow lakes (resacas) or in shade trees in towns. In Mexico and Central America, breeds in many kinds of open woods, mature forest, second growth, edges of clearings. Winters in lowland tropical forest in South America.

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Feeding Behavior

Forages by searching for insects among the foliage, often hovering briefly to pick insects from the undersides of leaves.

Eggs

Usually 3, sometimes 2. White, with specks of brown. Incubation is by female alone, 13-14 days. Young: Both parents feed the nestlings. Young leave the nest 12-14 days after hatching, but can fly only poorly at this stage.

Young

Both parents feed the nestlings. Young leave the nest 12-14 days after hatching, but can fly only poorly at this stage.

Diet

Mostly insects and spiders, some berries. Feeds on a wide variety of insects, including tree crickets and various smooth caterpillars, also many others. Also eats many spiders. Diet includes berries and small fruits, including those of mistletoe, and some seeds, including those of the tropical shrub Clusia.

Nesting

Details of the breeding behavior have not been well studied. Males sing persistently in spring and summer to defend the nesting territory. Nest: Placed 5-40' above the ground in branch of tree or shrub. Nest (built by female alone) is a neatly built open cup, with its rim woven onto a horizontal forked twig. Nest is made of grass blades, plant fibers, cobwebs, strips of papery bark, the outside often heavily decorated with spiderwebs; lined with fine plant fibers.

Illustration © David Allen Sibley.
Learn more about these drawings.

Text © Kenn Kaufman, adapted from
Lives of North American Birds

Migration

Strictly a summer resident in Mexico and Central America, arriving late in spring. A few from western Mexico apparently go the wrong direction in fall, as there are several fall records along the California coast.