Small animals from two to nearly five feet in length; elongated cylindrical bodies with long tails, covered from snout to tip of tail with large angular fish-like scales, from which in some parts of India they are called bun-rohu, or the jungle carp; also in Rungpore Keyot-mach, which Jerdon translates the fish of the Keyots, but which probably means khet-mach or field-fish—but in this I am open to correction. The scales overlap like tiles, the free part pointing backwards. These form its defensive armour, for, although the manis possesses powerful claws, it never uses them for offence, but when attacked rolls itself into a ball.

In walking it progresses slowly, arching its back and doubling its fore-feet so as to put the upper surface to the ground and not the palm. The hind-foot is planted normally—that is, with the sole on the earth.

The tongue is very long and worm-like, and covered with glutinous saliva; and, much of this moisture being required, the sub-maxillary glands are very large, reaching down under the skin of the neck on to the chest.

The external ear is very small, and internally it is somewhat complicated, there being a large space in the temporal bone which communicates with the internal ear, so that, according to Professor Martin-Duncan, one tympanum is in communication with the other.

These animals are essentially diggers. The construction of their fore-arms is such as to economise strength and the effectiveness of their excavating instruments. The very doubling up of their toes saves the points of their claws. The joints of the fore-fingers bend downwards, and are endowed with powerful ligaments; and in the wrist the scaphoid and semi-lunar bones are united by bone, which increases its strength. As Professor Martin-Duncan remarks: "Every structure in the creature's fore-limbs tends to the promotion of easy and powerful digging, and, as the motion of scratching the ground is directly downwards and backwards, the power of moving the wrist half-round and presenting the palm more or less upwards, as in the sloths and in man, does not exist. In order to prevent this pronation and supination the part of the fore-arm bone, the radius, next to the elbow, is not rounded, but forms part of a hinge joint." He also notices another interesting peculiarity in the chest of this animal, the breast-bone being very long; the cartilage at end large, with two long projections resembling those of the lizards. There is no collar-bone.