The ground pangolin (Smutsia temminckii), also known as Temminck's pangolin, Cape pangolin or steppe pangolin, is one of four species of pangolins which can be found in Africa, and the only one in southern and eastern Africa. The animal was named for the Dutch zoologist Coenraad Jacob Temminck. As a group, pangolins are among the most critically endangered and illegally trafficked animals in the world. Physical description Pangolins are almost completely covered in overlapping, protective scales, which makes up about 20% of their body weight. The scales are composed of keratin, the same material that forms human hair and fingernails, and give pangolins an appearance similar to a pinecone or artichoke. The underside of a pangolin is not covered with scales, but sparse fur, instead. When threatened, it usually rolls up into a ball, thus protecting its vulnerable belly. Pangolins are 30 to 90 cm (1 to 3 feet) long exclusive of the tail and weigh from 5 to 27 kg (10 to 60 pounds). Across all eight species, adult tail length ranges from about 26 to 70 cm (approximately 10 to 28 inches). Mature adults are light brown, olive, and dark brown in color, while young are pale brown or pink in color. Ground pangolins walk on their hind legs, occasionally using their forelegs and their tail for balance. Their limbs are adapted for digging. They have five toes each with the fore feet having three long, curved claws, which are designed to demolish termite nests and to dig burrows. Because of these claws, pangolins must balance on the outer edges of their fore feet and tuck in the claws to prevent damage. Pangolins have long, broad tails and small, conical heads with jaws that lack teeth. To replace the act of chewing, the pangolin stomach is muscular, with keratinous spines that project into the interior and contains small stones to mash and grind prey, similarly to a bird's gizzard. Pangolins also have long, muscular tongues to reach and lap up ants and termites in cavities. Their tongues stretch so far, they are actually longer than their bodies. The tongue is attached in the lower cavity, near the pelvis and the last pair of ribs, and is able to retract and rest in the chest cavity. Pangolins have no external ears, so have poor hearing, as well as poor vision, although they do have a strong sense of smell.