Wednesday, Sep 3, 2014

Yellow-green Vireos

Vireo


Yellow-green VireoThe Yellow-green Vireo, Vireo flavoviridis is often confused with the Red-eyed Vireo, with which it is sometimes considered conspecific (of, or belonging to, the same species).


Distribution:

Its range stretches from southern Texas in the United States south to central Panama. It is migratory bird, wintering in the western Amazon basin. The Yellow-green Vireosreturn to Central America from early February to March, and most depart southwards by mid-October.

This vireo can be found in the canopy and middle levels of light woodland, the edges of forest, and gardens at altitudes from sea level to 1500 m.


Nesting / Breeding:

The female builds a 6.5 cm wide cup nest using a wide range of plant materials attached to a stout twig. The nest is normally placed 1.5 - 3.5 m above the ground in a tree, but occasionally up to 12 m high.

The breeding season is from March through June, and a normal clutch consists of two or three brown-marked white eggs, which the female incubates alone. However, the male assists in feeding the chicks.


Description:

The adult Yellow-green Vireos are average 14-14.7 cm in length and 18.5 g in weigh. They have olive-green upperparts and a dusky-edged grey crowns. There is a dark line from the bill to the red-brown eyes, and a white supercilium. The underparts are white with yellow breast sides and flanks. Adult Yellow-green Vireo differs from Red-eyed Vireo in its much yellower underparts, lack of a black border to the duller grey crown, yellower upperparts and different eye color.

Immature birds are duller with brown eyes, a brown tint to the back, and less yellow on the underparts.


Diet:

Yellow-green Vireos feed on berries and insects, especially caterpillars and beetles.


Song / Call:

The Yellow-green Vireo has a nasal nyaaah call and the song is a repetitive veree veer viree, fee’er vireo viree, shorter and faster than that of Red-eyed Vireo. This species rarely sings on its wintering grounds


Species Research by Sibylle Johnson

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