Hamsters

 Hamsters like a good workout.
Because they have a high metabolism, hamsters require a lot of exercise. A hamster wheel will keep them busy, but keep it oiled with mineral oil if the cage is near your sleeping area, or you may end up hearing your hamster jogging all night long. Hamsters also enjoy rolling around on the floor inside clear plastic hamster balls made specifically for that purpose. Just be sure to monitor the hamster in its ball as it rolls, so that it doesn’t roll off a table or down stairs and get injured.

Hamsters’ teeth grow continuously.
Therefore, you need to provide them with something to chew on, so their teeth stay worn down and healthy. Wood blocks and toys made from hay are good for this purpose, but avoid cedar, pine and soft plastic items, because they can be harmful if ingested.
Some hamsters have a bangs and most of them really eats carrots like a donkey.