The red of the throat appears paler in some Mexican and Guatemalan
skins; others, however, are not distinguishable from the northern specimens.
Habits. This species is found throughout eastern North America, as far west as the Missouri Valley, and breeds from Florida and the valley of the Rio Grande to high northern latitudes. Richardson states that it ranges at least to the 57th parallel, and probably even farther north. He obtained specimens on the plains of the Saskatchewan, and Mr. Drummond found one of its nests near the source of the Elk River. Mr. Dresser found this bird breeding in Southwestern Texas, and also resident there during the winter months, and I have received their nests and eggs from Florida and Georgia. It was found by Mr. Skinner to be abundant in Guatemala during the winter months, on the southern slope of the great Cordillera, showing that it chooses for its winter retreat the moderate climate afforded by a region lying between the elevations of three and four thousand feet, where it winters in large numbers. Mr. Salvin noted their first arrival in Guatemala as early as the 24th of August. From that date the number rapidly increased until the first week in October, when it had become by far the most common species about Dueñas. It seemed also to be universally distributed, being equally common at Coban, at San Geronimo, and the plains of Salamá.
The birds of this species make their appearance on our southern border late in March, and slowly move northward in their migrations, reaching Upper Georgia about the 10th of April, Pennsylvania from the last of April to about the middle of May, and farther north the last of May or the first of June. They nest in Massachusetts about the 10th of June, and are about thirteen days between the full number of eggs and the appearance of the young. They resent any approach to their nest, and will even make angry movements around the head of the intruder, uttering a sharp outcry. Other than this I have never heard them utter any note.
Attempts to keep in confinement the Humming-Bird have been only partially successful. They have been known to live, at the best, only a few months, and soon perish, partly from imperfect nourishment and unsuitable food, and probably also from insufficient warmth.
Numerous examinations of stomachs of these birds, taken in a natural state, demonstrate that minute insects constitute a very large proportion of their necessary food. These are swallowed whole. The young birds feed by putting their own bills down the throats of their parents, sucking probably a prepared sustenance of nectar and fragments of insects. They raise, I think, but one brood in a season. The young soon learn to take care of themselves, and appear to remain some time after their parents have left. They leave New England in September, and have all passed southward beyond our limits by November.
A nest of this bird, from Dr. Gerhardt, of Georgia, measures 1.75 inches in its external diameter and 1.50 in height. Its cavity measures 1.00
in depth and 1.25 inches in breadth. It is of very homogeneous construction, the material of which it is made being almost exclusively a substance of vegetable origin, resembling wool, coarse in fibre, but soft, warm, and yielding, of a deep buff color. This is strengthened, on the outside, by various small woody fibres; the whole, on the outer surface, entirely and compactly covered by a thatching of small lichens, a species of Parmelia.
A nest obtained in Lynn, Mass., by Mr. George O. Welch, in June, 1860, was built on a horizontal branch of an apple-tree. It measures 1.50 inches in height, and 2.25 in its external diameter. The cavity is more shallow, measuring .70 of an inch in depth and 1.00 in diameter. It is equally homogeneous in its composition, being made of very similar materials. In this case, however, the soft woolly material of which it is woven is finer in fibre, softer and more silky, and of the purest white color. It is strengthened on the base with pieces of bark, and on the sides with fine vegetable fibres. The whole nest is beautifully covered with a compact coating of lichens, a species of Parmelia, but different from those of the Georgian nest.
The fine silk-like substance of which the nest from Lynn is chiefly composed is supposed to be the soft down which appears on the young and unexpanded leaves of the red-oak, immediately before their full development. The buds of several of the oaks are fitted for a climate liable to severe winters, by being protected by separate downy scales surrounding each leaf. In Massachusetts the red-oak is an abundant tree, expands its leaves at a convenient season for the Humming-Bird, and these soft silky scales which have fulfilled their mission of protection to the embryo leaves are turned to a good account by our tiny and watchful architect. The species in Georgia evidently make use of similar materials from one of the southern oaks.