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Those hippos In addition to elephants and rhinoceroses, the hippopotamus (Hippopotamus amphibius) is the largest land mammal on earth. The average weight of an adult is 1,500 kilograms. Rivers, lakes, and mangrove swamps are all habitats for hippos. Hippos are semi-aquatic animals that require sufficient water to immerse themselves in the water while remaining close to the grass. On the body of a hippo, the skin is about six centimeters thick with very little hair on it. There are several territorial bulls, each of whom oversees a stretch of water and a group of five to thirty calves and cows. They are threatened by habitat loss and poaching for their meat and ivory (canine teeth). A hippo's lifespan is typically 40 to 50 years. As of 2017, the IUCN Red List drawn up by the International Union for Conservation of Nature (IUCN) lists the species as vulnerable, with a stable population estimated between 115,000 and 130,000 animals.
