The nest is but slightly formed of a few twigs, and lined with dry root-fibres. The eggs, two in number, are snow-white. The young are fed by both parents. More than two broods are seldom produced in the year, sometimes there is only one, but this appears to depend upon the time of laying, which in some parts of the United States begins as early as March, in others not until the middle of May, and on the borders of Lake Superior still later in the year. The usual roosting-places of these birds are among long grass in deserted fields, or dried stalks of corn, amid the stubble, or among the withered foliage of trees. They will return to favourite roosting-grounds from a considerable distance; but though a whole flock often settles in one locality, they seldom roost very near to each other, and if any one approach, even in the darkest night, will at once rise and take flight. The note of the Carolina Turtle Dove is low, plaintive, and repeated at intervals; in the early spring it may be heard among the newly-budding trees of the forest, even at a considerable distance. "The Passenger Pigeon," writes Audubon, "or, as it is usually named in America, the Wild Pigeon, moves with extreme rapidity, propelling itself by quickly repeated flaps of the wings, which it brings more or less near the body, according to the degree of velocity which is required. Like the Domestic Pigeon, it often flies during the love season in a circling manner, supporting itself with both wings angularly elevated, in which position it keeps them until it is about to alight. Now and then, during these circular flights, the tips of the primary quills of each wing are made to strike against each other, producing a smart rap, which may be heard at a distance of thirty or forty yards. Before alighting, the Wild Pigeon, like the Carolina Parrot and a few other species of birds, breaks the force of its flight by repeated flappings, as if apprehensive of receiving injury from coming too suddenly in contact with the branch or spot of ground on which it intends to settle. I have commenced my description of this species with the above account of its flight because the most important facts connected with its habits relate to its migrations. These are entirely owing to the necessity of procuring food, and are not performed with a view of escaping the severity of a northern latitude, or of seeking a southern one for the purpose of breeding. They, consequently, do not take place at any fixed period or season of the year; indeed, it sometimes happens that a continuance of a sufficient supply of food in one district will keep these birds absent from another for years. I know that in Kentucky they remained for several years constantly, and were nowhere else to be found. They all suddenly disappeared, when the mast was exhausted, and did not return for a long period.