Yellow-thighed Brushfinch

The yellow-thighed brushfinch is about 18 cm (7.1 in) long and weighs 27 to 35 g (0.95 to 1.2 oz). The sexes have the same plumage. Adults have puffy lemon yellow feathers on their tibiae that give the species its English name. They have a black crown. The rest of their head and their upperparts are sooty slate and their wings and tail are almost black. Their chin and throat are blackish and their underparts are dull slate. They have a dark rusty brown iris, a black bill, and black to gray legs and feet. Voice: One author described the yellow-thighed brushfinch's primary song as "high, spritely, and somewhat squeaky". Others have called it "bubbly", "metallic", "tinkling", "flowing", "squissing" and "spinking". It is sung by both sexes year-round.