Collared Grosbeak

The Collared Grosbeak, Mycerobas affinis, stands as a contender for the title of the largest species within the diverse finch family. This bird exhibits sexual dimorphism, with males and females donning distinct plumages. The male is characterized by a glossy black head, upper-wings, and tail, set against a rich, deep yellow body and an earthy brownish collar. In contrast, the female sports an olive-green back and a yellowish underside, with no black markings on the face. Juvenile birds resemble the adult female in appearance.

Identification Tips

Adult males are unmistakable with their black and yellow plumage and brownish collar. Females and juveniles can be identified by their olive-green and yellow coloring. The species ranges in size from 22 to 24 cm in length, with a robust build suited to their seed-based diet. The wing chord measures between 12.1 to 13.8 cm, the tail from 8.7 to 9.7 cm, the bill from 2.7 to 2.9 cm, and the tarsus from 2.6 to 2.9 cm.

Habitat

The natural habitat of the Collared Grosbeak is mountainous deciduous or mixed forests, where they can be found among stands of maple, oak, or rhododendron. During the summer, they may also venture above the tree line to dwarf juniper regions.

Distribution

This species graces the northern regions of the Indian Subcontinent, primarily the Himalayas, and extends to some adjoining areas. Its presence has been recorded in Bhutan, India, Myanmar, Nepal, and Thailand.

Behaviour

The Collared Grosbeak is known to exhibit altitudinal movements, descending to lower elevations in winter. They are typically seen in pairs or small parties, often perching near the tops of tall trees but foraging in lower vegetation or on the ground. Their flight is fast and direct, sometimes with an undulating pattern, and they fly in tight flocks.

Song & Calls

The flight call is a mellow, rapid series of "Pip-pip-pip-pip-uh," while a sharp "kurr" serves as an alarm call. The male's song is a clear, loud, and rising whistle of five to six notes. A creaky groan may be heard during antagonistic interactions.

Diet and Feeding

The Collared Grosbeak feeds on a variety of seeds, pine cones, buds, shoots, nuts, and fruits, including crab apples. They use their strong bills to pluck tough plant life. Insects, mainly caterpillars, and snails also form part of their diet.

Conservation status

The Collared Grosbeak is currently listed as Least Concern on the IUCN Red List, indicating that it is not at immediate risk of widespread decline.