. The birds of Illinois and Wisconsin. Birds; Birds. 332 Field Museum of Natural History — Zoology, Vol. IX. because they are partial to salt water, many of the species occur in large numbers on the interior lakes, rivers, and marshes. Their food consists of mollusks, small fish, and crustaceans, as well as the roots of aquatic plants and seeds. Their nests are usually placed on the ground or among rocks, al- though a few species, such as the Golden-eye, BufHe Head, etc., lay their eggs in hollow Genus MARILA Oken. 51. Marila americana (Eyton). Redhead. Aythya americana (Eyt.), A. O. U
. The birds of Illinois and Wisconsin. Birds; Birds. 332 Field Museum of Natural History — Zoology, Vol. IX. because they are partial to salt water, many of the species occur in large numbers on the interior lakes, rivers, and marshes. Their food consists of mollusks, small fish, and crustaceans, as well as the roots of aquatic plants and seeds. Their nests are usually placed on the ground or among rocks, al- though a few species, such as the Golden-eye, BufHe Head, etc., lay their eggs in hollow Genus MARILA Oken. 51. Marila americana (Eyton). Redhead. Aythya americana (Eyt.), A. O. U. Check List, 1895, p. 52. Local name: Redhead Duck. Distr.: North America, breeding from Maine, northern Michigan, Wisconsin, and California northward. Winters in numbers from Chesapeake Bay to Florida and along the Gulf coast to Texas, casual as far south as Mexico and Jamaica. Adult male: Head and neck, brownish chestnut; lower neck and upper breast, blackish; back, apparently grayish, being white pencilled with fine, wavy lines of black; speculum, gray- ish; upper feathers edged with black, the rest narrowly tipped with white. Length, 21; wing, ; tarsus, ; bill, Adult female: Bill, bluish, showing an in- distinct bar near the end; head and neck, reddish brown, palest on the sides of the head, becoming ashy on the sides of the head; upper throat, white; breast and sides, brownish; belly, white; under tail coverts and lower belly, sometimes washed with pale brownish. Length, ; wing, ; tarsus, ; bill, A common species in Illinois and Wisconsin during the migrations and, according to Kumlien and Hollister, a few pairs still breed in Wisconsin in the marshes about Lake Koshkonong. The nest is in a marsh, made loosely of grass and usually lined. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble th
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