The caribou has very wide, heavy horns, and they are almost always circular--that is, the main part or trunk of each horn curves outward from the skull and then inward towards the point, in an almost true semicircle. They are more or less branched, but both the general shape of the whole horns and of the branches is such that when the head is thrown up and back they aid the animal's flight by presenting what may be called the point of a wedge towards the saplings and limbs and small forest growths through which the beast runs, parting and spreading every pair of obstacles to either side, and bending every single one out of the way of his flying body. The caribou of North America is the reindeer of Greenland; the differences between the two are very slight. The animal's home is the arctic circle, but in America it feeds and roams farther south than in Europe and Asia. It is a large and clumsy-looking beast, with thick and rather short legs and bulky body, and, seen in repose, gives no hint of its capacity for flight. Yet the caribou can run "like a streak of wind," and makes its way through leaves and brush and brittle, sapless vegetation with a modicum of noise so slight as to seem inexplicable. Nature has ingeniously added to its armament, always one, and usually two, palmated spurs at the root of its horns, and these grow at an obtuse angle with the head, upward and outward towards the nose. With these spurs--like shovels used sideways--the caribou roots up the snow, or breaks its crust and disperses it, to get at his food on the ground. The caribou are very large deer, and their strength is attested by the weight of their horns. I have handled caribou horns in Canada that I could not hold out with both hands when seated in a chair. It seemed hard to believe that an animal of the size of a caribou could carry a burden apparently so disproportioned to his head and neck. But it is still more difficult to believe, as all the woodsmen say, that these horns are dropped and new ones grown every year.