A wide variety of animals are kept as pets, from invertebrates such as tarantulas and octopuses, insects including praying mantises,[39] reptiles such as snakes and chameleons,[40] and birds including canaries, parakeets and parrots[41] all finding a place. Mammals are the most popular pets in the Western world, with the most kept species being dogs, cats, and rabbits. For example, in America in 2012 there were some 78 million dogs, 86 million cats, and 3.5 million rabbits.[42][43][44] There is a tension between the role of animals as companions to humans, and their existence as individuals with rights of their own.[45]