Mammalia (Mammals) - Rat
External charateristics
The body is divided into a head, neck, trunk and tail and is covered by hair. The rat has two pairs of limbs. Each of the front legs has four toes, each with a claw. Each of the hind legs has five toes, each with a claw. On the head are two ears with pinnae directed to the front. At the front of the head below the ears are two eyes, each with a movable upper and lower eyelid and a nictitating membrane. At the tip of the pointed snout are two extenal nostrils just above the split upper lip of the mouth. …
