The love-season of the Partridge commences early in March, and is indicated by the drumming of male birds. This sound is produced by the male bird only, who, standing on a fallen log or on an elevated rock in the most retired portion of the woods, lowers his wings, expands his tail, contracts his neck, and seems to inflate his whole body. The tufts of feathers on either side of the neck are elevated, and the bird struts and wheels about in the most pompous manner possible to imagine. After manœuvring in this manner for some time, he begins to strike the sides of his own body with his stiffened wings with short and rapid strokes. These become more and more rapid, until the noise they produce seems continuous. These sounds may be heard at all hours of the day, but more generally early in the morning. The sound thus produced has generally been compared to that produced by beating together two distended bladders. But this gives one a very inadequate idea of the rolling, reverberating, ventriloquistic noise which these birds thus occasion. It is more like the distant and closing reverberations caused by remote thunder, and seems to the listener much nearer than it really is. It may be imitated in several ways, so as even to deceive the bird, and to bring him, in a fatal impulse of jealousy, to the shot of the sportsman.
In the spring these birds feed on the buds of several kinds of trees, especially the birches. In Maine they are particularly fond of the buds of the black birch, which gives to their flesh a peculiar and very agreeable flavor, and from this in certain localities they are known as the Birch Partridge. They also feed largely on the esculent berries of the summer, as raspberries, blueberries, and huckleberries, and in the fall become plump and fat, and are esteemed a great delicacy.
Mr. Audubon states that, as this bird rises from the ground, it utters a cackling note, which it repeats six or seven times, and then emits a lisping whistle, like the cry of some young bird, which is rather remarkable. When the ground is covered by a fall of light snow, these birds dive into it and conceal themselves, sometimes burrowing through it to the depth of several feet. When pursued, they frequently escape in this manner. Many are taken under the snow; others are snared by nooses, or by means of figure of four traps.
This Grouse is more or less polygamous, and both sexes are somewhat promiscuous in their intercourse. The males only remain with the females until incubation has commenced, and then keep by themselves, unless recalled by the females when their eggs have been taken or destroyed. The males occasionally indulge in severe contests for the possession of the female, but not to the same extent as with the Pinnated Grouse.
The female places her nest in some retired spot, usually on the edge of the woods, or near an opening in it, always on the ground, and often under the shelter of a projecting rock or a fallen log. The nest is very rude and simple, consisting of only a few leaves laid in a depression and not woven together. The eggs are from seven to twelve in number, and are generally of a uniform yellowish-brown color, and are very rarely mottled or spotted. During incubation the Partridge sits very closely, and permits a near approach before she will leave her charge. The young Partridges leave the nest as soon as they are hatched, following their mother, who calls to them with a clucking sound not unlike that of the common domestic Hen. The mother is very devoted, courageous, and wily in defending them. Coming suddenly upon a young brood of Partridges squatted with their mother near the roadside in a woods, my first knowledge of their presence was received from the old bird flying directly at my face, and then tumbling about at my feet with frantic manifestations of distress and imitated lameness. In the mean while the little ones scattered in every direction, and were not to be found. As soon as she was satisfied of their safety, the parent flew to a short distance, and I soon heard her clucking call to them to come to her again. Altogether, it was one of the most striking scenes of parental devotion and well-managed intervention I ever witnessed. When I came upon the mother, she had squatted upon the ground, and the young had taken refuge under her wings.
The males keep apart from the females and the young until the approach of winter, when they reassemble in their search for food. In severe seasons, when the snow lies very deep, especially in Pennsylvania, they are said to feed on the buds of the Mountain Laurel, or some other poisonous shrub which imparts a poisonous character to their flesh. In Maine they have been accused of resorting to apple-orchards and destroying the fruit-buds, thus occasionally causing a serious injury to the prospective harvest. We apprehend there is some foundation for these charges.
Mr. William Street, of Easthampton, who resides on Mount Tom, writes me that he has found this Grouse very numerous in that vicinity. Having lived in a secluded place ten years, and having met with these birds constantly by day and by night, he has been able to note some interesting peculiarities in their habits. The drumming by the male is often made on a stone as well as a log, the same perch being resorted to, when once chosen by a male bird, as long as it lives. In one instance he knew one of these Partridges persistently adhere to its drumming-place, even though the woods had all been cut away and a new road made close by its post. They roost on the ground as well as on trees, when near their home, and just where night overtakes them. They can fly by night as well as by day, when disturbed, as he has often had occasion to notice, having started them up at all hours of the night. They are very local in their habits, and never wander more than a hundred rods from the drumming-place of the male. This spot seems to be the central point around which they live. The young keep with the old birds throughout the fall and winter, and select their own homes in the spring, not far from those of their parents. When a flock is started up, they separate and fly in every direction; but if one sits quietly down and keeps perfectly still, in less than an hour he will see them all coming back, on foot, and all at about the same time.
The eggs of this species measure 1.60 inches in length by 1.15 in breadth. They are usually unspotted and of a uniform dark cream-color, occasionally marked with darker blotches of the same. They are of an elongated oval, pointed at one end.
Bonasa umbellus, var. umbelloides, Douglas.
THE MOUNTAIN PARTRIDGE.
Tetrao umbelloides, Dougl. Linn. Trans. XVI, 1829, 148. Bonasa umbellus, var. umbelloides, Baird, Birds N. Am. 1858, 925 (appendix). Bonasa umbelloides, Elliot, P. A. N. S. 1864. Bonasa umbellus, Aud.—Dall & Bannister, Tr. Chicago, Ac. I, 1869, 287 (Alaska, interior).