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A common pattern in North America is clockwise migration, where birds flying North tend to be further West, and flying South tend to shift Eastwards. Many, if not most, birds migrate in flocks. For larger birds, flying in flocks reduces the energy cost. Geese in a V formation may conserve 12–20% of the energy they would need to fly alone.
In the summer, these birds can be found in California and from Montana to Utah, along the eastern Rocky Mountains. Their habitat includes rangelands and savannas . These birds migrate to their winter quarters between Southern California and northern Central America .
The California quail is the official state bird of California. This list of birds of California is a comprehensive listing of all the bird species seen naturally in the U.S. state of California as determined by the California Bird Records Committee (CBRC). [1] Additional accidental and hypothetical species have been added from different sources.
The summer range is from British Columbia to western Ontario, south to Colorado and west to Oregon. In winter, the range extends from southern Canada and northern California, south to Mexico. [8] The northwestern goldfinch (S. t. jewetti) is smaller and darker than the other subspecies.
The brown-headed cowbird (Molothrus ater) is a small, obligate brood parasitic icterid native to temperate and subtropical North America. It is a permanent resident in the southern parts of its range; northern birds migrate to the southern United States and Mexico in winter, returning to their summer habitat around March or April.
Most hummingbirds migrate in the winter to Central America or Mexico, but some hummingbirds spend the winter on the Gulf Coast and may be found in South Texas and South Louisiana during mild winters.
[16] [17] Many populations are permanent residents or altitudinal migrants, while in cold years they may choose to stay in their winter range and breed there. [16] For example, in the Sierra Nevada Mountains of eastern California, J. hyemalis populations will migrate to winter ranges 5,000–7,000 feet (1,500–2,100 m) lower than their summer ...
Western tanagers migrate alone or in groups of up to 30 birds. [11] [12] On average, hatching-year western tanagers were captured later (early September) at Rio Grande Nature Center than adult western tanagers (mid-August) during fall migration. Migration timing, condition of birds, and site differences in spring and fall migration were also ...