Giant antshrike

The giant antshrike (Batara cinerea) is a species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds". It is found in Argentina, Bolivia, Brazil, and Paraguay.

The giant antshrike is the largest antbird, 27 to 35 cm (11 to 14 in) long and weighing 100 to 155 g (3.5 to 5.5 oz). The species exhibits significant sexual dimorphism, though both sexes have a crest, a very long and wide tail, and a long gray bill with a hook at the end like true shrikes. Adult males of the nominate subspecies have a black forehead, crown, and crest. Their back, wings, and tail are barred with black and white. Their face, nape, throat, and underparts are neutral gray. Adult females have a rufous crest with some black feather tips. Their back, wings, and tail are barred with cinnamon-buff and dark brown. Their face, nape, throat, and underparts are mostly olive that becomes yellowish by their crissum. Subspecies B. c. argentina is smaller than the nominate. Compared to it, males have fewer bars on their wings and tail; females have less black on their crest, slightly paler upperparts, and warmer underparts. B. c. excubitor is paler overall than argentina, and the difference might be clinal.