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American Tree Sparrow
Though the North American winter resident known as the American Tree Sparrow looks much like the North American breeding season's Chipping Sparrow, there is, in fact, little overlap in the occurrence of these two birds. The first American Tree Sparrows typically arrive in late October, and within a week, Chipping Sparrows depart. Conversely, American Tree Sparrows depart in late March, within a week of the Chipping Sparrow's arrival. As a result, it is rare to see American Tree Sparrows and Chipping Sparrows in the same location.
American Tree Sparrow Range Map

American Tree Sparrows are approximately 6 inches (15 centimeters) in length. A large sparrow with a long tail and a rufous cap, American Tree Sparrows have an unmistakable characteristic: a dark spot in the center of their breast, and frosty edges to their wings and tail.

The crown and post ocular stripe are rufous in color, and the supercilium, cheeks, throat, and nape are gray. A distinctive rufous-colored comma extends from the bend of the wing into the gray breast, which also sports the characteristic deep brown spot in the center. The flanks of an American Tree Sparrow have a variable buff wash, whereas the belly is gray. The back is rusty brown with dark streaks, the scapulars are darkish brown with even darker centers, and the "tertials" and secondaries have frosty edges that create a characteristic edged look. The outermost outer tail feathers are pale and dusky with a thin outer vane approaching white. The next one in is a darker brown, but a shade paler than the rest of the rectrices. From below, however, all tail feathers are the same color. The upper mandible, legs, and feet are dark; the lower mandible is predominantly yellow.

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