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The willow goldfinch [9] (S. t. salicamans) occurs west of the Sierra Nevada range during the summer and in the central and southern Baja California Peninsula to the Mojave Desert and the Colorado Desert in the winter. In winter, the plumage of both sexes is browner than the other subspecies and in summer, the male's black cap is smaller than ...
The American goldfinch displays sexual dimorphism in its coloration; the male is a vibrant yellow in the summer and an olive color during the winter months, while the female is a dull yellow-brown shade which brightens only slightly during the summer. The male displays brightly colored plumage during the
The metabolic rates of this species are typically 40% higher than a "normal" songbird of their size. When temperatures plunge as low as −70 °C (−94 °F), they can accelerate that rate up to five times normal for several hours. They also put on half again as much winter fat as their common redpoll and American goldfinch relatives.
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American goldfinch: Spinus tristis: mid-Alberta to North Carolina during the breeding season, and from just south of the Canada–United States border to Mexico during the winter Lawrence's goldfinch: Spinus lawrencei: California and Baja California, winters in the southwestern United States and northern Mexico Lesser goldfinch: Spinus psaltria
In the winter, when many of these birds are migrating, farmers are now flooding their fields in order to provide temporary wetlands for birds to rest and feed before continuing their journey. [146] Rice is a major crop produced along this flyway, and flooded rice paddies have shown to be important areas for at least 169 different bird species ...
Lawrence's goldfinch is known for its wandering habits. It breeds from about Shasta County, California to northern Baja California, largely in the Coast Ranges and the foothills of the Sierra Nevada and in the Baja highlands, but also sometimes as far down as the coast; its highest breeding altitude is about 8,800 ft (2,700 m) on Mount Pinos.
The male is still mostly in winter plumage. Red Army soldiers in snow camouflage near Moscow, December 1941. There are at least 11 soldiers in the image. Snow camouflage is the use of a coloration or pattern for effective camouflage in winter, often combined with a different summer camouflage.