Description wikipedia

The green-backed becard (Pachyramphus viridis) is a species of passerine bird in the family Tityridae, the tityras, becards, and allies. It is found in Argentina, Bolivia, Brazil, Guyana, Paraguay, Uruguay, and Venezuela. The green-backed becard includes the yellow-cheeked becard as a subspecies. The green-backed becard is about 14.5 to 16 cm (5.7 to 6.3 in) long; two individuals of the nominate subspecies weighed 18 and 21 g (0.63 and 0.74 oz). Adult males of the nominate subspecies have a glossy black crown, whitish lores, and a thin yellowish eye-ring. The lower part of their face and their nape are pale gray. Their upperparts are mostly bright olive with dusky olive flight feathers and tail. Their throat is whitish, their breast bright yellow to olive yellow, and the rest of their underparts grayish white with a buffy tinge. Adult females have a similar pattern to males. However, their crown is dull olive, their lores grayish, and their face grayer. Their upperparts are pale olive and their wing coverts rufous-chestnut. Their breast is a more muted yellow and their underparts overall somewhat more dusky than the male's. The male of subspecies P. v. griseigularis has a grayish olive face and nape. It has blackish flight feathers with olive edges. The underparts are mostly grayish white with grayer sides and flanks than the nominate's. The male of the subspecies P. v. xanthogenys has bright yellow cheeks, sides of neck and throat. The male of subspecies peruanus is very simililar to xanthogenys but has a slightly brighter yellow face and breast. Both sexes have a dark iris, a pale bluish horn bill, and dusky or grayish legs and feet.