Sierran Elaenia

The sierran elaenia (Elaenia pallatangae) is a species of bird in subfamily Elaeniinae of family Tyrannidae, the tyrant flycatchers. It is found in Bolivia, Colombia, Ecuador, and Peru. == Taxonomy and systematics == The sierran elaenia has three subspecies, the nominate E. p. pallatangae (Sclater, 1862). E. p. intensa (Zimmer, 1941), and E. p. exsul (Todd, 1952). For much of the twentieth century what are now the two subspecies of the tepui elaenia (E. olivina) were also treated as subspecies of it. The tepui elaenia was not recognized as a separate species until about 2008 after which taxonomic systems made the change. == Description == The sierran elaenia is 14 to 15 cm (5.5 to 5.9 in) long and weighs about 12 to 18 g (0.42 to 0.63 oz). It is a small elaenia without a crest. The sexes have the same plumage. Adults of the nominate subspecies have an olive head with lighter and yellower cheeks, yellowish lores, a yellowish eyering, and a thin white strip in the center of the crown. Their upperparts are olive. Their wings are dusky olive with paler edges on the flight feathers. The tips of their wing coverts are yellowish white and show…