Teal
2 of the 7 encyclopedias on this shelf carry an entry for Teal. Both are reproduced below, so you can see where they agree and where they differ.
Collier's New Encyclopedia (1921)
a popular name for any individual of the genus Querquedula. They are the smallest of the ducks, and widely distributed over the world, generally frequenting rivers and lakes, and feeding, principally at night, on aquatic insects, worms, small mollusks and vegetable matter. The common teal, Q. crecca, is plentiful in most parts of Europe; length is about 14 inches, head of male brownish-red, the body transversely undulated with dusky lines, white line above and another below the eye, speculum black and green. It nests on the margins of lakes or rivers, collecting a mass of vegetable matter, lining it with down, and laying 8 or 10 eggs. The flesh is extremely delicate, and the bird might be be advantageously introduced into the poultry yard. summer Q. circia is the garganey, or teal; Q. carolinensis, the green-winged teal of the United States, closely resembles the common teal, but has a white crescent in front of the bend of the wings; Q. discors, with the same habitat, is the blue-winged teal. Aix galericulata the Mandarin duck, is sometimes called the Chinese teal.
Aiton's Encyclopedia (1910)
tel, a handsome, undersized, fresh water duck resembling the wood-duck in coloring. There are many species well distributed throughout the world. The species best known to American sportsmen are the blue-winged and the green-winged teal. A third kind is the cinnamon teal. They are much alike in their habits. Relying on their diminutive size and swiftness of flight, they are bolder than the larger mallard or canvasback. In flight, their wings make a peculiar whistling noise. In lighting, they dive promptly into cover without hovering about to detect danger. A flying teal comes down the wind at from 80 to 100 miles an hour. Less dainty in their food than their larger associates, they are known often as mud-ducks. In British Columbia the green-wing haunts the streams, feeding on putrid salmon until it is unfit for table use. In its winter home among the rice swamps of the south, its flesh acquires an exquisite flavor. See Duck.