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Pangolins are nocturnal animals, and use their well-developed sense of smell to find
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Pangolins were classified with various other orders, for example Xenarthra, which includes the ordinary anteaters, sloths, and the similar-looking armadillos. But newer genetic evidence indicates that their closest living relatives are the Carnivora, with which they form the clade Ferae. Some paleontologists have classified the pangolins in the order Cimolesta, together with several extinct groups.
The physical appearance of pangolins is marked by large, hardened, plate-like scales. The scales, which are soft on newborn pangolins but harden as the animal matures, are made of keratin, the same material of which human fingernails and tetrapod claws are made. The pangolin is often compared to a walking pine cone or globe artichoke. It can curl up into a ball when threatened, with its overlapping scales acting as armour and its face tucked under its tail. The scales are razor-sharp, providing extra defence. The front claws are so long that they are unsuited for walking, and so the animal walks with its fore paws curled over to protect them. Pangolins can also emit a noxious smelling acid from glands near the anus, similar to the spray of a skunk. Pangolins have short legs, with sharp claws which they use for burrowing into termite and ant mounds, as well as climbing.
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The tongues of pangolins are extremely elongated and extend into the abdominal cavity. By convergent evolution pangolins, the giant anteater, and the tube-lipped nectar bat, all have tongues which are unattached to their hyoid bone and extend past their pharynx deep into the thorax. This extension lies between the sternum and the trachea. Large pangolins can extend their tongues as much as 40 cm (16 inches), with a diameter of only 0.5 cm (1/4 inch).
In pangolins, the section of the brain that relates to problem solving is highly developed. Although their problem solving ability is primarily used to find food in obscure locations, when kept in captivity pangolins are remarkable escape artists.
Arboreal pangolins live in hollow trees, whereas the ground dwelling species dig tunnels underground, up to a depth of 3.5 m (11 feet). Pangolins are also good swimmers.
Pangolins lack teeth and the ability to chew. Instead, they tear open anthills or termite mounds with their powerful front claws and probe deep into them with their very long tongues. Pangolins have glands in their chests to lubricate the tongue with sticky, ant-catching saliva.
Some species, such as the Tree Pangolin, use their strong, prehensile tails to hang from tree branches and strip away bark from the trunk, exposing insect nests inside.
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Pangolins are hunted and eaten in many parts of Africa and are one of the more popular types of bush meat. Pangolins are also in great demand in China because their meat is considered a delicacy and some Chinese believe pangolin scales reduce swelling, promote blood circulation and help breast-feeding women produce milk. This, coupled with deforestation, has led to a large decrease in the numbers of Giant Pangolins. In November 2010, pangolins were added to the Zoological Society of London's list of genetically distinct and endangered mammals.
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The Guardian provided a description of the killing and eating of pangolins: "A Guangdong chef interviewed last year in the Beijing Science and Technology Daily described how to cook a pangolin: 'We keep them alive in cages until the customer makes an order. Then we hammer them unconscious, cut their throats and drain the blood. It is a slow death. We then boil them to remove the scales. We cut the meat into small pieces and use it to make a number of dishes, including braised meat and soup. Usually the customers take the blood home with them afterwards.'"
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