Cabanis's Ground Sparrow

Cabanis's ground sparrow is about 15 cm (5.9 in) long. The sexes have the same plumage. Adults have a black forecrown. The rest of their crown and their ear coverts are chestnut or chestnut-rufous; the latter have a thin U-shaped black line around their bottom half. They have white lores, a white eye-ring, and white cheeks, chin, and throat with a thin black "moustache". Their back, scapulars, rump, uppertail coverts, wings, and tail are olive or olive-brown, though their nape, upper back, and lesser wing coverts are somewhat grayish. Voice: The song of Cabanis's ground sparrow is "a high, thin, staccato sputter, a buzzy note, and/or a slow trill followed by 3-4 clear, forceful whistles: Pst-t-t-t peee-peer-peer, bzeew whee-whee-whee, or bzeew tow-hewhewhewhe peer-peer-peer-pee". Its calls include "weak, high, staccato, tsit notes", a sharp whistled "pseee psee psee", and a "sharp, thin pseeer".