The Jerboa, for the most part, stands upon his hind-legs; he rests himself by sitting backwards sometimes, and I have seen him, though rarely, as it were lie upon all four; whether that is from fatigue or sickness, or whether it is a natural posture, I know not. The Jerboa of the Cyrenaicum is six inches and a quarter in length, as he stands in the drawing. He would be full half an inch more if he was laid straight at his length immediately after death. The head, from his nose to the occiput, is one inch two lines. From the nose to the foremost angle of the eye, six lines. The opening of the eye itself is two lines and a quarter; his ears three quarters of an inch in length, and a quarter of an inch in breadth; they are smooth, and have no hair within, and but very little without; of an equal breadth from bottom to top, do not diminish to a point, but are rounded there. The buttocks are marked with a semicircle of black, which parts from the root of the tail, and ends at the top of the thigh. This gives it the air of a compound animal, a rat with bird’s legs, to which the flying posture still adds resemblance. From this stroke to the center of the eye is three inches, and to the point of his toe the same measure; his tail is six inches and a quarter long, seems aukwardly set on, as stuck between his buttocks, without any connection with his spine; half of it is poorly covered with hair of a light or whiter colour than his body; the other half is a beautiful feather of long hair, the middle white, the edges jet black: this tail, which by its length would seem an incumbrance to him, is of a surprising advantage in guiding and directing him in his jumping. From the shoulder to the elbow of the fore-foot is half an inch: from the elbow to the joining of the paw, 5/8ths of an inch. The claw itself is curved, and is something less than a quarter of an inch. It has very long mustachoes, some of them standing backward, and some of them forward from his nose; they are all of unequal lengths, the longest an inch and a half; his belly is white: he seems to be of a very cleanly nature, his hair always in great order. From his snout to the back part of the opening of the mouth is half an inch; his nose projects beyond his under jaw three quarters of an inch. He has four toes in his hind-foot, and a small one behind his heel, where is a tuft of hair coloured black. The fore-foot hath three toes only.