Victor, 10, reports on what makes hamsters different from other rodents.
Hamsters belong to a group of animals called rodents and like all rodents they have very powerful front teeth.
They weigh around 150g and are about the same size as your hand.
Hamsters don't have tails
Also in the rodent group are mice and rats.
The main difference between hamsters and mice and rats is that the hamster does not have a tail.
The other noticeable difference is their size - mice are much smaller and rats are bigger.
Born blind with no fur
Hamster babies are about 4cm long when they are born and have no fur.
They are also born blind, but their fur will grow in about 6 days and they open their eyes around the 12th day.
By four weeks they are old enough to leave the nest.