Collared Grosbeak
Mycerobas affinis
Large, bulky, bright-colored finch of middle to high altitude broadleaf and mixed forests. Male has a jet-black head and back and a bright yellow belly and collar. Female is olive-yellow overall with a gray head and black wingtips. Both sexes have a pale, heavy bill. Usually seen in pairs or small flocks. Often perches on exposed treetops. Gives a mellow, descending series of notes while in flight. Passingly similar in appearance to Spot-winged and White-winged Grosbeaks, but Collared Grosbeak lacks white on the wing.
Identification
The collared grosbeak may be the largest species in the diverse finch family, but several other species, including others in the genus Mycerobas, may rival it in size. The species can range in length from 22 to 24 cm (8.7 to 9.4 in). The body mass of two males was reportedly 69 and 72 g (2.4 and 2.5 oz), while a single female weighed 83 g (2.9 oz). Among standard measurements, the wing chord is 12.1 to 13.8 cm (4.8 to 5.4 in), the tail is 8.7 to 9.7 cm (3.4 to 3.8 in), the bill is 2.7 to 2.9 cm (1.1 to 1.1 in) and the tarsus is 2.6 to 2.9 cm (1.0 to 1.1 in). Adult males are glossy black on the head, upper-wings and tail. Contrasting with the black head, the collar is an earthy brownish color. The rest of the male's plumage is a rich, deep yellow. The female is olive-green on back and yellowish below with no black about the face. The juvenile birds are fairly similar in appearance to the adult female.<p>The flight call of this bird is a mellow but rapid Pip-pip-pip-pip-uh. It is also known to utter a sharp alarm call, kurr. The male's song is a clear, loud and rising whistle consisting of five to six notes. The grosbeaks may utter a creaky groan in antagonistic interactions.
Taxonomy
- Scientific name
- Mycerobas affinis
- Authority
- (Blyth, 1855)
- Order
- Passeriformes
- Family
- Fringillidae
- Genus
- Mycerobas
Range and habitat
- Migration
- Vertical migration
Behavior
The collared grosbeak ranges from fairly common to scarce within its range. The species summers and breeds at an elevation of 2,700 to 4,200 m (8,900 to 13,800 ft). It engages in altitudinal movements, by winter traveling to as low as 1,800 m (5,900 ft) or even to 1,060 m (3,480 ft). This grosbeak occurs in mixed and coniferous forests, commonly around stands of maple, oak or rhododendron. It also may occur during the summer in dwarf juniper above the tree line in the mountains. Pairs or small parties usually perch near the tops of tall trees but forage often in lower vegetation or even on the ground. The collared grosbeak flies in tight flocks in a fast, direct but sometimes undulating flying style. The breeding behavior of this species is unknown. The grosbeak feeds on a variety of seeds and pine cones as well as buds or shoots, nuts, fruits (including crab apples). A variety of this tough plant life is plucked with the strong bill. It may also feed on insects, mainly caterpillars, as well as snails.
Conservation
- Population trend
- stable
Photos
Distribution
Bird Calls
Other Birds
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