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The only finch in its subfamily to undergo a complete molt, the American goldfinch displays sexual dichromatism: the male is a vibrant yellow in the summer and an olive color during the winter, while the female is a dull yellow-brown shade which brightens only slightly during the summer.
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.
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).
The male and female American goldfinches travel together searching for suitable nest sites. The female goldfinch builds a nest made of twigs, rootlets, and plant stems, and usually 4 to 20 feet ...
The lesser goldfinch (Spinus psaltria) is a small finch in the genus Spinus native to the Americas.. As is the case for most species in the genus Spinus, lesser goldfinch males have a black forehead, which females lack.
Male above, female below in Ystad. The European greenfinch is 15 cm (5.9 in) long with a wingspan of 24.5 to 27.5 cm (9.6 to 10.8 in). It is similar in size and shape to a house sparrow, but is mainly green, with yellow in the wings and tail. The female and young birds are duller and have brown tones on the back. The bill is thick and conical. [11]
Both the male and female great-billed seed finch are very similar in appearance to the male and female large-billed seed finch. [7] It is a medium-sized finch at around 14.5-16.5 cm in length. [7] The juvenile is similar in appearance to the female. [7] Sexual dimorphism presents itself in males when they begin to sing. [9]
The large ground finch weighs about 27-39 g, and its length ranges slightly 15-16 cm. [2] It is the largest species of Darwin's finch both in total size and size of beak. The feather and bill colors vary between males and females.
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