Appearance
The whiskered myiobius is very similar in appearance to several closely related species. It has olive upper parts, an obvious yellow rump and a usually well-concealed yellow patch on the crown.The rictal bristles round the beak are long and form a basket-like structure. The underparts are greyish-olive and the belly pale yellow. The tail is black and somewhat rounded. It is usually a silent bird, but sometimes utters a staccato "psik".
Naming
Six subspecies are recognised; ''M. b. semiflavus'' from east and central Colombia; ''M. b. barbatus'' from southeastern Colombia to northern Peru, south Venezuela, the Guianas and northern Brazil; ''M. b. amazonicus'' from eastern Peru and western Brazil; ''M. b. insignis'' from northeastern Brazil, south of the River Amazon; ''M. b. mastacalis'' from southeastern Brazil, south of the River Amazon. The subspecies ''M. b. mastacalis'' is sometimes split as the yellow-rumped myiobius.Distribution
The species is widely distributed in tropical South America. It is found in the Amazon basin in the northern half of Brazil, northeastern Peru, eastern Ecuador, eastern Colombia, southern Venezuela, Guyana, Suriname and French Guiana.Status
No particular threats facing this bird have been identified. It is generally uncommon, but it has a very wide range and the population seems to be steady, so the International Union for Conservation of Nature has rated its conservation status as being of "least concern".Behavior
Like other myiobius, the diet consists largely of insects, many of which are caught aerobatically on the wing. It often forages in small mixed flocks. When perched, this bird often droops its wings and fans the feathers of the tail in a manner reminiscent of Old World fantails.Habitat
Its typical habitat is the lower parts of the canopy of humid rainforest at altitudes of less than 900 m. It is more often found in the middle of forests than is the black-tailed myiobius, and in Amazonia occurs at lower elevations than the tawny-breasted myiobius.References:
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