Slender-footed Tyrannulet

The slender-footed tyrannulet (Zimmerius gracilipes) is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is found in Bolivia, Brazil, Colombia, Ecuador, Peru, and Venezuela. == Taxonomy and systematics == The slender-footed tyrannulet was originally described as Tyranniscus gracilipes. Through much of the twentieth century it and several other tyrannulets were kept in genus Tyranniscus but a study published in 1977 erected the present genus Zimmerius for them. The slender-footed tyrannulet has two subspecies, the nominate Z. g. gracilipes (Sclater, PL & Salvin, 1868) and Z. g. gilvus (Zimmer, JT, 1941). What are now the red-billed tyrannulet (Z. cinereicapilla) and the Guianan tyrannulet (Z. acer) were previously treated as additional subspecies. == Description == The slender-footed tyrannulet is 9 to 12 cm (3.5 to 4.7 in) long and weighs 6.6 to 9.5 g (0.23 to 0.34 oz). The sexes have the same plumage. Adults of the nominate subspecies have a gray forehead and crown. They have a thin whitish supercilium that starts at their lores and a dark stripe through the eye on an otherwise yellowish white face. Their back and rump are dull olive. Their wings are dusky with thin yellow edges on the coverts and…