Half-collared Sparrow

The half-collared sparrow is about 15 cm (5.9 in) long and weighs 22 to 28 g (0.78 to 0.99 oz). The species is sexually dimorphic but not dramatically so. Adult males have a black crown with a gray stripe through its middle, black lores, and a white supercilium that extends to the nape. The rest of their face is black. Their nape and the sides of their neck are gray. Their upperparts, wings, and tail are mostly greenish olive with somewhat more yellowish green on the lesser wing coverts. They have a white throat. Voice: One song of the half-collared sparrow is "a high-pitched series of three whistles, each whistle descending in frequency, and each lower in pitch than previous one, tzee–tzeuuu-tzééúúúú". Another has "an up-down, up-down pattern, swee-swóóó swee-swóóó". Its call is a metallic "sharp ringing tiip".