Description wikipedia

The Allpahuayo antbird (Percnostola arenarum) is a Vulnerable species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds". It is endemic to northeastern Peru. == Taxonomy and systematics == The Allpahuayo antbird was formally described in 2001. The holotype is a female collected in 1998 and further specimens were collected during studies in the same general area. The study authors assigned the new species to genus Percnostola that had been erected in 1860; it shares this genus with the black-headed antbird (P. rufifrons). The specific epithet arenarum is derived from the Latin word for "sand", "arena", to reflect the sandy soils of the species' main habitat. The English name recognizes the Zona Reservada Allpahuayo-Mishana. The Allpahuayo antbird is monotypic. However, females of a sub-population have different colored underparts than the rest and might represent a second subspecies. == Description == The Allpahuayo antbird is 13 to 15 cm (5.1 to 5.9 in) long. One male weighed 22.9 g (0.81 oz) and one female 24.2 g (0.85 oz). Adult males have mostly dark gray upperparts that are darkest on their forecrown and lightest in the center of their back. Their wings are dark gray and their wing coverts black with white edges and tips. Their tail is dark gray with paler gray outer edges. Their lores and ear coverts are dark gray, their chin and throat blackish, and the rest of their underparts dark gray. Adult females have dark gray crown, nape, and upperparts. Their wings are dark gray and their wing coverts black with reddish yellow-brown tips. Their tail is dark gray with paler bluish gray outer edges on the feathers. Their face is a paler gray than their crown and has a yellowish brown tinge. Their chin and the center of their throat are white with a reddish yellow-brown tinge. The underparts of most females are mostly reddish yellow-brown that is darker on the breast than on their belly and crissum. The center of their belly is white and their sides and flanks have a dusky tinge. In one area females have tawny underparts. Both sexes have a gray iris and bluish gray legs and feet. Males have a black bill; females have a black maxilla and a bluish gray mandible.