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The house finch is a moderate-sized finch, 12.5 to 15 cm (5 to 6 in) long, with a wingspan of 20 to 25 cm (8 to 10 in). Body mass can vary from 16 to 27 g (9 ⁄ 16 to 15 ⁄ 16 oz), with an average weight of 21 g (3 ⁄ 4 oz).
This patch varies in brightness among individuals because the pigments that produce the red color (carotenoids) are limited in the environment. Thus, males who have a high-quality diet will have brighter red plumage. In a much-cited manipulation experiment, female house finches were shown to prefer males with brighter red patches.
In one experimental population of zebra finches, there was increased singing activity by the male after breeding. [9] This increase is positively correlated with the partner's reproductive investment. The female finches were bred in cages with two subsequent males that differed with varying amounts of song output.
A flying paradox, the house finch is both native and introduced to North America. Originally native to Mexico and the Western United States, house finches were shipped to New York City and sold as ...
The female is more subdued in colouring, but both sexes have two contrasting white wing bars and white sides to the tail. The male bird has a strong voice and sings from exposed perches to attract a mate. The chaffinch breeds in much of Europe, across the Palearctic to Siberia. The female builds a nest with a deep cup in the fork of a tree.
American goldfinch (Spinus tristis) male (left) and female (right) in Johnston County, North Carolina, USA. The finches have a near-global distribution, being found across the Americas, Eurasia and Africa, as well as some island groups such as the Hawaiian islands.
Cassin's finch Male Female Haemorhous cassinii (Baird, 1854) western North America as far south as northern New Mexico and Arizona; also Southern California near Baja California. Size: Habitat: Diet: LC Purple finch Male Female Haemorhous purpureus (Gmelin, 1789)
The eggs are incubated for 11–13 days by the female, who is fed by the male. The chicks are fed by both parents. Initially they receive a mixture of seeds and insects, but as they grow the proportion of insect material decreases. [25] For the first 7–9 days the young are brooded by the female. The nestlings fledge 13–18 days after hatching.
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