Black-chested Sparrow

Overview

The black-chested sparrow, Peucaea humeralis, is a species of bird in the family Passerellidae endemic to Mexico. It is classified as Least Concern by the IUCN, with an estimated population of at least 20,000 mature individuals that is currently decreasing.

Identification

• Plumage: Adults feature a mostly blackish head with a white spot on the lores and a white 'moustache', with the black extending under the white throat to form a band across the chest. The scapulars and back are rufous with darker brown mottling, while the rump and uppertail coverts are olive-brown.
• Markings: Wings are blackish brown with paler brown edges, except the greater coverts have white tips that show as two wing bars. Underparts below the chest band are mostly whitish with a cinnamon wash on the flanks and undertail coverts.
• Bill and Legs: Possesses a brown iris, a black maxilla, a blue-gray mandible, and pale pinkish legs and feet.
• Song: Vocalisations include a high liquid twittering preceded by short introductory notes described as 'bzz, bzz, bzz, t-chip ichip tip-i-see', along with a 'chatter-song' and calls like 'pit-za' or a 'chip followed by a trill'.

Habitat

Found inland in southwestern Mexico from southern Jalisco and Colima, south to Guerrero and southwestern Oaxaca, and east to Morelos and Puebla. It inhabits arid lowland and montane scrub forest and thorn forest in the tropical and lower subtropical zones, generally between sea level and 1,500 m.

Diet

During the breeding season, the species feeds mostly on larval and adult insects, supplemented by some seeds and fruit. Foraging typically occurs singly or in pairs, occasionally in small family groups, mostly at the tops of trees by gleaning while perched or hovering after a brief sortie.

Did you know?

Pairs of black-chested sparrows sometimes sing in duet, adding a cooperative element to their vocalisations. They are also noted for having a soft 'whisper song' alongside their more typical twittering.