Black-chinned Siskin

The black-chinned siskin is 12 to 13 cm (4.7 to 5.1 in) long and weighs about 13 to 20 g (0.46 to 0.71 oz). The species is sexually dimorphic. Adult males have black lores, forehead, and crown. Their face is olive or green with a yellowish wash and a bright yellowish supercilium from behind the eye to the side of the neck. Their nape and back are olive green with thin dark streaks and their rump and uppertail coverts are yellow to yellowish green. Their tail is mostly black with yellow bases on all but the innermost pair of feathers. Their wings have a complicated pattern. Voice: The black-chinned siskin's song is "a loud series of musical phrases and trills" and sometimes includes call notes. Its calls include a "rising tsooeet", an "abrupt chit or chit-tip", a "more subdued tsi-tsi-tsi, together with a more prolonged twittering note", and "a short chup in flight".