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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.
Bright yellow and red carotenoid pigments are commonplace in this family, and thus blue structural colours are rather rare, as the yellow pigments turn the blue color into green. Many, but by no means all true finches have strong sexual dichromatism, the females typically lacking the bright carotenoid markings of males. [1]
The family Fringillidae are the "true" finches. The International Ornithological Committee (IOC) recognizes these 239 species in the family, distributed among three subfamilies and 50 genera. Confusingly, only 79 of the species include "finch" in their common names, and several other families include species called finches.
Patagonian yellow finch: Sicalis lebruni (Oustalet, 1891) 239 Greenish yellow finch: Sicalis olivascens (d'Orbigny & Lafresnaye, 1837) 240 Monte yellow finch: Sicalis mendozae (Sharpe, 1888) 241 Greater yellow finch: Sicalis auriventris Philippi & Landbeck, 1864: 242 Raimondi's yellow finch: Sicalis raimondii Taczanowski, 1874: 243 Puna yellow ...
The house finch (Haemorhous mexicanus) is a North American bird in the finch family. It is native to Mexico and southwestern United States , but has since been introduced to the eastern part of North America and Hawaii; it is now found year-round in all parts of the United States and most of Mexico, with some residing near the border of Canada .
Northernmost breeding birds migrate south, as do some birds throughout the range of the species; many birds are permanent residents, however. Some non-breeding birds winter as far south as central interior Mexico. These birds forage in trees, sometimes in ground vegetation. They mainly eat seeds, buds and berries, some insects. When not nesting ...
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The European goldfinch was one of the birds described and illustrated by Swiss naturalist Conrad Gessner in his Historiae animalium of 1555. [2] The first formal description was by Carl Linnaeus in the 10th edition of his Systema Naturae published in 1758. He introduced the binomial name, Fringilla carduelis.