Illustration: Virginia Deer. The males frequently engage in combats, in which their horns sometimes become so interlocked that neither can escape, and they then remain engaged in fruitless struggles till they perish of famine, or become the prey of the wolf or the hunter. Heads of deer which have thus perished are frequently found, and there is scarcely a museum in this country which has not one or more specimens. The following instance is given by Say in Long’s Expedition to the Rocky Mountains. ‘As the party were descending a ridge, their attention was called to an unusual noise proceeding from a copse of low bushes, a few rods from the path. On arriving at the spot, they found two buck deer, their horns fast interlocked with each other, and both much spent with fatigue, one in particular being so much exhausted as to be unable to stand. Perceiving that it would be impossible that they should extricate themselves, and must either linger in their present situations or die of hunger, or be destroyed by the wolves, they despatched them with their knives, after having made an unavailing attempt to disentangle them. Beyond doubt, many of these animals must annually thus perish.’ _Prong-horned Antelope._――This species was first described by the leaders of the first American expedition to the west of the Rocky Mountains. It is shy and timorous, wonderfully fleet, and with great acuteness of sight and smell. When once startled, they fly with the rapidity of the wind, and baffle all pursuit. In one instance, captain Lewis, after various fruitless attempts, by winding around the ridges, succeeded in approaching a party of seven that stood upon an eminence towards which the wind was unfortunately blowing. The only male of the party frequently encircled the summit of the hill, as if to announce any danger to the group of females which stood upon the top. Before they saw captain Lewis, they became alarmed by the scent, and fled while he was at the distance of two hundred yards. He immediately ran to the spot where they had stood; a ravine concealed them from him, but at the next moment they appeared on a second ridge, at the distance of three miles. He could not but doubt whether these were the same he had alarmed, but their number and continued speed convinced him they were so, and he justly infers that they must have run with a rapidity equal to that of the most celebrated race horse.