Among insects, those which have hard eyes have the forefeet long, in order that from time to time they may rub the eyes with their feet, as we frequently see done by flies. The insects which have long hind-feet are able to leap, the locust, for instance. All these insects have six feet: and some of the spiders have two very long feet in addition. They have, all of them, three joints. We have already"[1] stated that marine insects have eight feet, such as the polypus, the sæpia, the cuttle-fish, and the crab, animals which move their arms in a contrary direction to their feet, which last they move around as well as obliquely: they are the only animals the feet of which have a rounded form. Other insects have two feet to regulate their movements; in the crab, and in that only, these duties are performed by four. The land animals which exceed this number of feet, as most of the worms,[2] never have fewer than twelve feet, and some, indeed, as many as a hundred. The number of feet is never uneven in any animal. Among the solid-hoofed animals, the legs are of their proper length from the moment of their birth, after which they may with more propriety be said to extend themselves than to increase in growth: hence it is, that in infancy they are able to scratch their ears with the hind feet, a thing which, when they grow older, they are not able to do, because their increase of growth affects only the superficies of the body. It is for the same reason also, that they are only able to graze at first by bending the knees, until such time as the neck has attained its proper length.

(49.) There are dwarfs to be found among all animals, and among birds even.