Giant hutia
The giant hutias are an extinct group of large rodents known from fossil and subfossil material in the West Indies. One species, "Amblyrhiza inundata", is estimated to have weighed between , big specimens being as large as an American black bear. This is twice as large as the capybara, the largest rodent living today, but still much smaller than "Josephoartigasia monesi", the largest rodent known. These animals were probably used as a food source by aboriginal humans. All giant hutias are in a single family, Heptaxodontidae, which contains no living species; this grouping seems to be paraphyletic and artificial, however.
List of mammals of Tibet
The order Rodentia is the largest group of mammals. They have two ever-growing incisors in the upper as well as in the lower jaw and must be kept worn down by gnawing.Lagomorpha comprises rabbits, hares and pikas, which differ from rodents by having four incisors in the upper jaw and strictly herbivore diet.The order Artiodactyla in Tibet are mainly herbivores, and some are economically important as transport animals.The order Perissodactyla in Tibet is only comprised by a single species.There are over 250 species of carnivorans, which are the top predators in the food webs.