Yellow-rumped Marshbird

Male yellow-rumped marshbirds average 25.5 cm (10 in) long. Males weigh an average of 91.2 g (3.2 oz) and females average 81.9 g (2.9 oz). The sexes have the same plumage. Adults have a blackish brown head, neck, and upper breast. Their upperparts are mostly brown with a rich yellow rump. Their wings are mostly brown with rich yellow median and lesser coverts that show as an epaulet. Their tail is brown. Their lower breast and belly are rich yellow and their undertail coverts brown with thin yellow edges. Both sexes have a brown iris, a blackish bill, and blackish legs and feet. Voice: The yellow-rumped marshbird's song is "a mix of whistles, warbles, slurs and nasal buzzes" that is similar to that of the brown-and-yellow marshbird but slower and not as screechy. Its common calls are kwet-kwetéé and koink. Groups commonly vocalize together both when perched and in flight.