Brown Trembler

The nominate subspecies of brown trembler is 20.5 to 26 cm (8.1 to 10.2 in) long; males weigh 47.6 to 65.4 g (1.68 to 2.31 oz) and females 42.8 to 71 g (1.51 to 2.50 oz). The species has a long, slightly downcurved bill, the female's longer than the male's. Adults are mostly shades of brown. Their crown is a deep grayish brown, the nape less gray, the back an olive brown, and the rump and tail a reddish brown. The face is blackish through the eye with grayish olive brown cheeks. The chin and throat are pale grayish buff that becomes browner on the breast and belly. Voice: The brown trembler's principal song is "a series of variable loud phrases ranging in quality from 'rather harsh, others rich and warbled, still others high and squeaky'" It also has "subsongs" delivered less frequently. A common call is "a nasal, rasping yeeeah, often repeated many times".