Rodents are a large order of mammals called Rodentia, characterized by a single pair of continuously growing incisors in both upper and lower jaws that must be kept short by gnawing. This is the largest order of mammals, containing about 40 percent of all mammal species. Animals called rodents include mice, which are house mice and deer mice, rats including Norway rats and roof rats, squirrels including gray squirrels, red squirrels, and flying squirrels, chipmunks, gophers, beavers which are the second largest rodents, capybaras which are the largest living rodents native to South America, guinea pigs, hamsters, gerbils, porcupines, chinchillas, prairie dogs, marmots, voles, lemmings, and muskrats. Some animals that people think are rodents are not, for example rabbits and hares are lagomorphs, not rodents, though they also gnaw, and shrews and moles are insectivores. Rodents live on every continent except Antarctica and have adapted to almost every habitat from deserts to forests to cities. They are known for rapid breeding, with many species producing multiple litters per year. While many rodents are pests that contaminate food and damage property, others like beavers are ecosystem engineers and many like guinea pigs and fancy rats are kept as pets.
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