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The eastern bluebird (Sialia sialis) is a small North American migratory thrush found in open woodlands, farmlands, and orchards. The bright-blue breeding plumage of the male, easily observed on a wire or open perch, makes this species a favorite of birders.
Bluebirds lay an average of 4 to 6 eggs per clutch. They will usually brood two or three times in a year. Bluebirds nest from March all the way through August. Bluebirds have blue, or blue and rose beige, plumage. Female birds are less brightly colored than males, although color patterns are similar and there is no noticeable difference in size.
The color pattern may suggest the eastern and western bluebirds, but the smaller size (13–15 cm or 5–5.9 inches long), wingbars, and short and conical bunting bill quickly distinguish it. The female is brown, grayer above and warmer underneath, told from the female indigo bunting by two thin and pale wingbars and other plumage details.
An Eastern Bluebird checks out a feeder. In any event, the surge of bluebirds appearing all over the place throughout March is a very welcome and beautiful sign of spring. March is when the ...
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Mountain bluebird: Sialia currucoides: 1967 [34] New Hampshire: Purple finch: Carpodacus purpureus: 1957 [35] New Jersey: Eastern goldfinch (American goldfinch) Spinus tristis tristis: 1935 [36] New Mexico: Greater roadrunner: Geococcyx californianus: 1949 [37] New York: Eastern bluebird: Sialia sialis: 1970 [38] North Carolina: Northern ...
Adult female in Livermore, California. The western bluebird is a small stocky bird with a length of 15 to 18 cm (5.9 to 7.1 in). The adult male is bright blue on top and on the throat with an orange breast and sides, a brownish patch on back, and a gray belly and undertail coverts.
Results found that significantly more eggs were fertilised by the extra-pair male than expected proportionally from just one copulation versus many copulations with the other male. [24] EPC proportion varies between different species of birds. [25] For example, in eastern bluebirds, studies have shown that around 35% of offspring is due to EPC. [3]