Bats have nothing in common with birds, except the faculty of flying, and therefore must be classed among quadrupeds; but as the ability to fly implies a great degree of force in the superior and anterior parts of the body, the pectoral muscles of the bat are more strong and fleshy than those of any other quadruped, a circumstance in which they have some resemblance to birds; in every other respect their conformation both external and internal is different. The lungs, heart, organs of generation, and all other viscera, except the prominent sexual distinction, which is similar to that of a man or a monkey, are the same as in other quadrupeds; like them also they are viviparous, and have teeth and nipples. It has been affirmed that they bring forth only two at a time, that they suckle their young, and even carry them when they fly. It is in summer they couple and bring forth, for during winter they are in a state of torpor; some cover themselves with their wings as with a cloak, and suspend themselves by their hind legs in subterraneous caverns; others cling to walls, or conceal themselves in holes. When they retire they do it in numbers, and collect together to defend each other from the cold; and they pass the whole winter, from the end of autumn to the spring, without either food or motion. They can support hunger better than cold; and though they can subsist many days without food, they are nevertheless carnivorous; for when opportunity serves, they will devour meat of all kinds, whether raw or roasted, fresh or corrupted.