As an instance of the habits we may take _Ortyx virginianus_, called Bob-white from the shrill triple whistle of the male, which resembles "Ah-bob-white." It is a wary denizen of open woods and pastures, found in coveys, and roosting on the ground, though habitually taking refuge in trees, where it crouches upon the branches. It runs very swiftly, but rises, when hard pressed, with a whirring noise to fly for a short distance. The food consists of succulent shoots, seeds, berries, acorns, beech-nuts, and insects; the nest is imbedded in grass or placed at the foot of a tree, and is made of a little herbage, which may even arch over it; the white or drab eggs number from nine to eighteen. The male is said to assist in incubation, two broods being occasionally reared in a season. The female utters a clucking sound, and will feign lameness when with her brood. Other forms prefer pine-forests, rocky ground, or dry sandy flats overgrown with cactus and sage-brush; their cries being in some cases louder or more guttural, while the eggs may be blotched or spotted with reddish-brown. Nests have even been recorded low down in trees. _Ortyx virginianus_ has been {233}introduced into the West Indies and the Old World, though unsuccessfully in the latter; _Lophortyx californicus_ into Europe, the Sandwich Islands, and New Zealand, in the last two of which it is firmly established. In America, moreover, some species seem to have lately extended their range. Hybrids are occasionally found.