Hamsters are color-blind and don't see well at long distances. There are 25 species of hamsters in the world and they are classified into groups including Russian dwarf, Chinese and Syrian. Hamsters come in a variety of colors including fawn, black, white and grey.
Hamsters, like humans, are omnivores, meaning they eat everything from plants to meat. Generally pet hamsters don't eat meat, but in the wild, some species eat insects. Pet hamsters love to eat fruits and vegetables, nuts, seeds and berries.
Hamsters are one of the only pets that can catch a cold from humans. They hoard their food in cheek pouches and hide it somewhere safe so they can eat it later. Their teeth always grow, which is why pet hamsters need things like wood to chew on, or else their teeth will grow too long.
Hamsters are nocturnal, meaning they are awake at night and sleep during the day. Most hamsters sold as pets prefer to live alone and may fight with other hamsters. When a female has babies, she carries them from 18 to 22 days before giving birth. A female give birth to anywhere from three to 12 pups. Mother hamsters sometimes eat some or all of her pups, especially when she gives birth to too many to take care of or if one is born sick.