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Song sparrows' nests are parasitized by the brown-headed cowbird. The cowbirds' eggs closely resemble song sparrows' eggs, although the cowbirds' eggs are slightly larger. Song sparrows recognize cowbirds as a threat and attack the cowbirds when they are near the nest. There is some evidence that this behavior is learned rather than instinctual ...
Reviews and a field guide summarize the limited information available on Bachman's sparrow migration. [6] [7] [9] [10] Bachman's sparrows in the southern portion of their range are resident, while those in Missouri, Arkansas, eastern Oklahoma, Tennessee, Virginia, parts of North Carolina, and extreme northern Mississippi and Alabama have been thought to migrate south during winter. [7]
Melospiza is a genus of passerine birds formerly placed in the family Emberizidae, but now placed in Passerellidae.The genus, commonly referred to as "song sparrows," currently contains three species, all of which are native to North America.
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The song of the swamp sparrow is a monotone trill, slower than that of the chipping sparrow. A male can have a repertoire of several different trills. The common call note is a loud chip reminiscent of a phoebe.
White-throated sparrows breed in central Canada and New England. They nest either on the ground under shrubs or low in trees in deciduous or mixed forest areas and lay three to five brown-marked blue or green-white eggs. The tan and white morphs of white-throated sparrows use different reproductive strategies.
The breeding habitat is a variety of open habitats including grasslands and cultivation. Lark sparrows nest on the ground, laying three to six eggs in a grass cup nest sheltered by a clump of grass or other vegetation. The eggs are white with black scrawling. Lark sparrows are occasional victims of brood parasitism by the brown-headed cowbird. [2]
The courtship involves the male sparrow running with his wings raised and occasionally jumping around to sing its song. The cup shaped loose nest is placed on the ground. The clutch of 3–5 eggs, usually 4, is incubated by the female for 12–13 days. The chicks are fed by both parents and fledge after at least 9 days in the nest.