The domicile being ready for occupancy, the female soon commences to deposit her beautiful treasures. One by one they are laid on consecutive days, until her complement of three or four is reached. In the Southern States, oviposition commences in March or February, while in the northern limits of the range of this species, from the tenth to the fifteenth of April; seldom later. Incubation is mutual, and so attentive are the birds to the task, that it is an unusual occurrence to find them both absent therefrom at the same time. When the female is sitting, her partner improves the time by attending to the demands which hunger makes upon him. The same is true of the female when she has resigned her charge to the care of her noble and conscientious lord. So faithfully do they keep to the nest, that nothing but the most menacing danger will compel them to quit it. The approach of a team, or of a pedestrian, within a foot of it, has not been known to startle them. But when the danger is quite imminent, the sitting-bird slips out of it, and makes its way into the tall grasses, at some distance therefrom, and becomes a silent and sorrowful witness of the disaster to be accomplished. Should no destruction be perpetrated, and the intruder has gone his way, it cautiously comes out of its hiding-place, and resumes labors. But it has learned a lesson by this experience. For on a second visit to the same spot, no bird is to be found. Apprised of approaching danger, it has slipped out of the nest in time to escape detection. Thus patiently, persistently, and seemingly unweariedly, these faithful beings, by turns, apply themselves to the task, until success has crowned their willing labors. The time spent in hatching, under the most favorable circumstances, varies from seventeen to eighteen days.
The young are very timid creatures, and keep close to their parents, who manifest considerable solicitude for their well-being. They watch over their helpless infancy, so to speak, with a care which a human mother only knows, and when their lives are imperiled, resort to many a ruse to deceive their enemies, and bring them into places of safety. By a peculiar alarm, when severely pressed, the mother warns them of the condition of things, and while they are scattering in different directions, she seeks to attract attention to herself in many a well-feigned artifice. After the danger is past, by a familiar call she summons them together, and doubtless relates to them the story of her adventures, and the dangers to which they were exposed. Their food consists of worms, animalcula, ants and other soft-bodied insects, which the parents assist them in procuring from the soft earth, and beneath the grass and dead leaves that abound in the places which they frequent. Later on, they are able to obtain their subsistence with the address of older birds, by thrusting their bills into the soil, and in such other places as would be likely to contain the objects desired. Their tongues being covered with a viscid saliva, the food adheres thereto, and is drawn into the mouth without danger of being-lost. Gunners, as well as those who have made these birds a study, have often met with holes which have been made in the soft mud by their bills. The presence of these "borings," as they are called, is always considered as an indication that game is not very far distant, which a thorough exploration of the surrounding country soon reveals to be the fact. The young having thoroughly matured, continue in the same haunts with their parents, and, unless brought to an untimely death by the merciless gun of the hunter, repair to the warm, sunny, smiling South with the return of frost.
The eggs of this species are less pyriform than waders' mostly are, being, in some instances, almost ovoidal. Their ground-color varies from a light clay to one of buffy-brown, and the markings occur in the form of fine spots and blotches of chocolate-brown, interspersed with others of obscure lilac, scattered more or less thickly over the surface of the egg.
According to Dr. Coues, their size and intensity of color bear, in general, a direct correspondence with the depth of the background. In Massachusetts these eggs exhibit remarkable variation, passing from 1.45 to 1.80 inches in length, and from 1.15 to 1.25 in width. Out of a collection of a dozen specimens, Dr. Coues found the shortest and broadest egg to measure 1.40 by 1.20, and the longest, narrowest one, 1.55 by 1.15 inches. A set of three before us, from Pennsylvania, has an average measurement of 1.54 by 1.21 inches. In the Middle States, and the same is doubtless true of other sections of our great country, there is never more than a single brood raised, although the early breeding of the species would certainly give ample time for a second hatching before the close of the season. The drawing shows not merely the eggs in situ, although considerably reduced, but at the same time gives a beautiful and accurate figure of a typical specimen, alone and isolated. The female is represented as standing in the vicinity of the nest, while her partner occupies a sitting posture in the foreground of the picture. The total length of this species, from tip of bill to extremity of tail, is eleven inches. The wing has a stretch of two and a quarter inches. So well have the birds been portrayed by the artist, that we shall not attempt a description.
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Plate XXV.—COLYMBUS SEPTENTRION A LIS, Linnæus.—Red-throated Diver.
Chiefly a boreal species, especially during the breeding-season, the Red-throated Diver is only known to visit us during the winter. On our eastern sea-board it seldom attains a lower latitude than Maryland, while in the West it has been met with along the coast as far south as San Diego, California. Farther north, however, on the shore-line, around the inlets of Washington Territory adjacent to the British possessions, it is more abundant. Although of rare occurrence along the Atlantic coast of the United States (and it is mostly the young and immature birds that are to be seen) yet in Arctic regions the species meets with the essential conditions of soil and climate which render life a pleasure, and not a burden. Consequently, the birds abound in great numbers, and carry on their worldly affairs unexposed to the dangers which would most likely affect them in less severe localities that are the common resorts of man.