When the male Baltimores first arrive, they come unaccompanied by their mates. At this time their notes are unusually loud, and their voices seem shrill. Their song appears to partake somewhat of the nature of tender lamentations and complaining. At this period they are very active and restless, moving rapidly through the branches of the trees, just opening into leaf and blossom, searching busily for the insects which then form their principal food. When, a few days after their arrival, they are joined by the females, the whole character of their song changes, which becomes a lower-toned, richer, and more pleasing refrain. During their love-season their resonant and peculiarly mellow whistle resounds in every garden and orchard, along the highways of our villages, and in the parks and public squares of our cities. Nuttall, generally very felicitous in expressing by verbal equivalents the notes of various species of our song-birds, describes the notes of its song as running thus, _Tshippe-tshayia-too-too-tshippe-tshippe-too-too_, with several other very similar modifications and variations. But these characters give a very inadequate idea of their song. It must be heard to be appreciated, and no description can do justice to its beauties. The notes are of an almost endless variety, and each individual has his own special variations. The female, too, has her own peculiar and very pretty notes, which she incessantly warbles as she weaves her curiously elaborate nest. To agriculturists this Oriole renders immense service in the destruction of vast numbers of highly injurious insects; among the most noteworthy of these are the common canker-worm and the tent caterpillars, both great pests to orchards. These benefits far more than compensate for its annoying attacks on the pods of esculent peas, the only sin that can rightfully be brought against it, except, perhaps, the acts of theft committed against other birds, in seizing upon and appropriating to it materials collected by smaller birds for their nests. The Baltimore Orioles are devoted, faithful, and courageous parents, resolutely defending their young when in danger, and exposing themselves fearlessly to danger and to death rather than forsake them. If their young are taken and caged, the parents follow them, and, if permitted, will continue to feed them.