When buying fish, decide whether you want fresh or saltwater fish, consider what size tank they will need and the type of environment, such as plants and water temperature, they require. Small, cagable animals are also very popular. Rabbits, which can be caged or kept indoors, require daily exercise. They're social animals that pine away without a companion. If you are able to spend at least an hour a day with the animal, it's safe to adopt one, otherwise consider buying two rabbits.
Guinea pigs are also social and are happier when another guinea pig is around.
Gerbils are feisty colony animals. Timid people will do better with a guinea pig. Gerbils have short life spans and should be adopted as youngsters. Hamsters also make a good pets. They're solitary animals that sleep during the day and are noisy at night.