"The flight of this species," Audubon tells us, "is rapid, silent, and horizontal, as it moves from one tree to another, or across a field or river, and is generally continued amongst the branches of the trees in our woods. When making its way among the boughs, it occasionally inclines the body to either side, so as alternately to show its whole upper or under parts. During its southward migrations, it flies high in the air, and in such loose flocks that the birds seem to follow each other, instead of keeping together. On the other hand, the males arrive singly; the males coming first, and the females a few weeks after. They do not fly in a continued line, but in a broad front. This bird is not abundant anywhere, and yet is found very far north. I have met with it in all the low grounds and damp places in Massachusetts, along the line of Upper Canada, pretty high on the Mississippi and Arkansas, and in every State between these boundary lines. Its appearance in the State of New York takes place before the beginning of May, and at Green Bay not before the middle of that month. A pair here and there seem to appropriate certain tracts to themselves, where they rear their young in peace and plenty. The Yellow-billed Cuckoos feed on insects, such as caterpillars and butterflies, as well as on berries of various kinds, evincing a special predilection for the mulberry. In autumn they eat many grapes, and I have seen them supporting themselves by a momentary action of their wings opposite a bunch, selecting the ripest, when they would seize it and return to a branch, repeating their visits in this manner till satiated. They will also now and then descend to the ground to pick up a wood-snail or a beetle. They are extremely awkward at walking, and move in an ambling manner, or limp along sideways, a clumsiness for which their short legs are an ample excuse. They are seldom seen perched conspicuously on a twig; but, on the contrary, are generally to be found among the thickest boughs and foliage, where they emit their notes until late in the autumn, after which they are discontinued. The nest is simple, composed of a few dry sticks and grass, formed much like that of the Common Dove, and like it fastened to a horizontal branch, often within the reach of man. The bird would appear to make no particular selection as to situation or the nature of the tree, but settles anywhere indiscriminately. The eggs are four or five, of an oval form, and of a bright green colour. Only one brood is reared in the season, unless the first is removed or destroyed. According to Brewer the female commences sitting as soon as her first egg is deposited, it being no uncommon occurrence to find fresh-laid eggs and others containing almost fully developed young in the same nest. At first the young are principally fed on insects. Towards autumn they become very fat, and are fit for being eaten; few people, however, shoot them for the table, excepting the Creoles of Louisiana."