Guinea Pigs are a kind of animal that can be kept as pets at home. Although they look like pigs (with a big head and a small body, a crude neck and a chubby back part), they are actually mice instead of pigs. Guinea Pigs have many colors, and we can see brown ones in Hsinchu Zoo. As a species of mouse, Guinea Pigs' body size is big (compared to that of other mice). Their bodies are 20-25 centimeters long. They live in mountains and grasslands, and they eat grass and plants. Guinea Pigs are very friendly, so they can be friends with other animals or even humans. These lovely animals are safe in the world now, so we can find many of them everywhere.