Pausanias Description of Greece 9.21.3

[3] There is also a beast called the elk, in form between a deer and a camel, which breeds in the land of the Celts. Of all the beasts we know it alone cannot be tracked or seen at a distance by man; sometimes, however, when men are out hunting other game they fall in with an elk by luck. Now they say that it smells man even at a great distance, and dashes down into ravines or the deepest caverns. So the hunters surround the plain or mountain in a circuit of at least a thousand stadium-lengths, and, taking care not to break the circle, they keep on narrowing the area enclosed, and so catch all the beasts inside, the elks included. But if there chance to be no lair within, there is no other way of catching the elk.