Thick-billed Siskin

The thick-billed siskin is one of the larger members of genus Spinus and has the eponymous thick bill. It is 12.5 to 14 cm (4.9 to 5.5 in) long and weighs about 19 g (0.67 oz). The species is sexually dimorphic. Adult males of the nominate subspecies have a black head, neck, and throat with a thin yellow band around its lower edge. Their back and scapulars are olive-yellow with indistinct darker streaks. Their rump is greenish yellow and their uppertail coverts somewhat yellower. Their tail is mostly black with wide yellow edges at the bases of all feathers but the innermost. Voice: The thick-billed siskin's song is "a series of twitters" similar to that of other siskins but delivered faster and at a lower pitch. Its calls include "a wheezy hew-li?, a mewing rhee?, and a low chatter".