A pet, or companion animal, is an animal kept primarily for a person's company, entertainment or as an act of compassion such as taking in and protecting a stray cat, rather than as a working animal, livestock or laboratory animal. Popular pets are often considered to have attractive appearances, intelligence and relatable personalities, but some pets may be taken in on an altruistic basis and accepted as they are.
Two of the most popular pets are dogs and cats. The technical term for a cat lover is an ailurophile, and for a dog lover, a cynophile. Other animals commonly kept include: rabbits; ferrets; pigs; rodents, such as gerbils, hamsters, chinchillas, rats, and guinea pigs; avian pets, such as parrots, passerines and Fowls; reptile pets, such as turtles, alligators, crocodiles, lizards, and snakes; aquatic pets, such as fish, freshwater and saltwater snails, amphibians like frogs and salamanders; and arthropod pets, such as tarantulas and hermit crabs. Small pets may be grouped together as pocket pets, while the equine and bovine group include the largest companion animals.