Hooded Siskin

The hooded siskin is 10 to 12 cm (3.9 to 4.7 in) long. and weighs about 11 g (0.39 oz). The species is sexually dimorphic. Adult males of the nominate subspecies S. m. magellanicus have an entirely black head, throat, and upper breast. They have a bright yellow collar on the nape and the sides of their neck. Their lower nape, back, and scapulars are olive green with faint dark streaks. Their rump is bright yellow and their uppertail coverts are olive green. Their tail is mostly black with wide deep yellow edges on all but the innermost pair of feathers. Their wings have a complicated pattern. Voice: The hooded siskin typically sings from an open perch and also in flight; it sings for long periods. Its song is "a varied series of rapid short twittering tseet-tseet, tseet-weet, or tseet-weet-a-weeta interspersed with repeated phrases; several males often sing in concert". Its calls include "a light or lilting djey, djey; tseeu; and a long trilling trrrrrr".