The distinction between the paces of other animals resembles that between the walking and the running of man, and is equally definite. Take, for instance, the WALKING, TROTTING, and GALLOPING of the Horse. In WALKING the fore and the hind limbs of the _same_ side are moved together, or nearly together, but they do not leave the ground till the limbs of the opposite side are placed upon it; so that at one period all four limbs are upon the ground together. In TROTTING the fore and the hind limbs of _opposite_ sides move together; but, as in walking, neither of them are withdrawn from the ground till the opposite one has reached it[4]. [4] In WALKING the hind leg moves first, then the fore leg of the same side; and both reach the ground before the hind leg of the opposite side is raised. So that at one time there are three feet on the ground, at another two, but never less than two. In TROTTING, especially quick trotting, one foot is raised at the same instant that the opposite one is put down. This renders it difficult to make out the sequence of the movements. In GALLOPING, or CANTERING, the horse springs or bounds with all four limbs at the same time; all the feet are thrown up nearly together; all are off the ground together; and all reach the ground again nearly at the same time ready for another spring. I say that the feet are all thrown up _nearly_, and not _quite_, together, because the fore and the hind limbs of one side take the precedence a little of the others, or “lead,” as it is called. The trained horse is taught to lead, habitually, with one, usually the right, side, because the motion is more steady when the horse is accustomed to gallop in one way than if he be allowed to vary it. Directly the horse begins to gallop, the rider knows, by the motion, whether he is leading with the proper leg. In some animals, as the DEER, the two fore and the two hind feet move together exactly in galloping. Anthony Trollope tells us that in Panama, Cuba, and other Spanish countries in the West, the horses are “taught to pace, that is, move with the two off legs together, and then with the two near legs. The motion is exceedingly gentle, and well fitted for those hot climates, in which the rougher work of trotting would be almost too much for the energies of debilitated mankind.” This _pacing_ is probably only a quick walk.