This mole (_Scalops aquaticus_) is the most common species in the eastern portion of the United States. Moles are considered as animals of a fairly high order, on account of their forelegs' being developed into perfect scoops for digging. They live almost entirely in underground retreats, where they lead a very peculiar life. They are found over nearly all Europe, a great part of Asia, southern Africa, and North America, and their habits are in almost every respect similar. Their varieties are not numerous, but it is possible that there are still a great many species as yet unknown to naturalists. They are all shaped and endowed, says Brehm, in so striking a manner as to be instantly recognizable. The body is stout and of cylindrical shape, and merges into a small head without the intervention of a distinct neck. The body is supported on short legs; the forward pair appear to be relatively gigantic digging tools, while the hind limbs are longer and resemble those of the rat. The teeth are from thirty-six to forty-four in number. Moles all delight in fertile plains, though they are also found in mountains. As the effect of light is painful to them, they seldom come to the surface, and even in the depth of the earth they are more active by night than by day. Their movements in their underground passages are much more rapid than when on the surface of the ground, where they can scarcely walk. They are also good swimmers when compelled by necessity to resort to the water. Of the senses of the moles it is said those of smell, hearing, and touch are especially well developed, while that of sight is deficient. All moles are quarrelsome, are addicted to vicious biting, and they take pleasure in devouring their own kind. They eat only animal food, all kinds of insects living under ground, worms, and the like, though they also feed on small mammals and birds, frogs, and snails. They are exceedingly voracious, and as they can endure hunger only for a very short time, they do not hibernate. They are undoubtedly useful as exterminators of insects, though on account of their digging habits they are considered a nuisance by the farmer. It was long thought that moles were blind, or had no eyes. The eyes, however, are about the size of a small seed lie midway between the tip of the snout and the ears, and are completely covered with the hair of the head. They are protected by lids, and may be projected or retracted at will. Once or twice a year the female mole gives birth to from three to five young. They grow rapidly, and remain with the mother for one or two months. Then they begin digging on their own account and require no further attention. They have been found to be very difficult to keep in captivity by reason of their insatiable appetite.