A pet, or companion animal, is an animal kept primarily for a person's company or entertainment rather than as a working animal, livestock, or a laboratory animal. Popular pets are often considered to have attractive/cute appearances, intelligence, and relatable personalities, but some pets may be taken in on an altruistic basis and accepted by the owner regardless of these characteristics. Two of the most popular pets are dogs and cats. Other animals commonly kept include rabbits; ferrets; pigs; rodents such as gerbils, hamsters, chinchillas, rats, mice, and guinea pigs; birds such as parrots, passerines, and fowls; reptiles such as turtles, lizards, snakes, and iguanas; aquatic pets such as fish, freshwater snails, and saltwater snails; amphibians such as frogs and salamanders; and arthropod pets such as tarantulas and hermit crabs. Smaller pets include rodents as pets, while the equine and bovine group include the largest companion animals.

Digital pet - A virtual pet is a type of artificial human companion. They are usually kept for companionship or enjoyment, as people may choose to keep a digital pet instead of a real one. Digital pets have no concrete physical form other than the hardware they run on.
Robotic pet - Robotic pets are artificially intelligent machines that are made to resemble actual pets. While the first robotic pets produced in the late 1990s, were not too advanced, they have since grown technologically. Many now use machine learning, making them much more realistic.
Animal captivity - Animal captivity is the confinement of domestic and wild animals. More specifically, animals that are held by humans and prevented from escaping are said to be in captivity.
Animal hoarding - Animal hoarding, sometimes called Noah syndrome, is keeping a higher-than-usual number of animals as domestic pets without the ability to properly house or care for them, while at the same time denying this inability.
Anthrozoology - Anthrozoology, also known as human–nonhuman-animal studies, is the subset of ethnobiology that deals with interactions between humans and other animals.
Classroom pet - Classroom pets are animals that are present in an educational classroom as a pet.
Animals and humans

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