Leaden Antwren

The leaden antwren (Myrmotherula assimilis) is a species of bird in subfamily Thamnophilinae of family Thamnophilidae, the "typical antbirds". It is found in Bolivia, Brazil, Colombia, and Peru. == Taxonomy and systematics == The leaden antwren was described by the Austrian ornithologist August von Pelzeln in 1868 and given its current binomial name Myrmotherula assimilis. It has two subspecies, the nominate M. a. assimilis (Pelzeln, 1868) and M. a. transamazonica (Gyldenstolpe, 1951). == Description == The leaden antwren is 9 to 10.5 cm (3.5 to 4.1 in) long and weighs 8.2 to 10.5 g (0.29 to 0.37 oz). It is a small bird with a short tail. Adult males of the nominate subspecies have a medium gray crown, back, and rump with a hidden white patch between the shoulders. Their wing coverts are medium gray with white tips and their flight feathers are dusky. Their tail is gray. Their underparts are pale gray that is palest on the throat. Adult females have a medium brownish gray to olive gray crown, back, and rump with a hidden white patch between the shoulders. Their wings are olive brown with pale buff or whitish buff tips on the coverts. Their tail is gray…