Hamsters are popular because they are small, but small does not mean simple. They are nocturnal or crepuscular, need surprisingly large enclosures and can be stressed by too much handling, noise or cramped housing.
Syrian hamsters
Syrian hamsters must be housed alone. They are larger and often easier to handle than dwarf hamsters, but they still need a large enclosure, deep bedding and a suitable wheel. Keeping two together can lead to serious fighting.
Dwarf hamsters
Dwarf hamsters are small, quick and sometimes harder for children to handle safely. Some species are kept alone in practice because group housing can be unstable. Ask experienced keepers for species-specific advice before buying.
Before you choose
Plan the enclosure before the hamster arrives: deep bedding, sand bath, hiding places, chew items and a large wheel with a solid running surface. If you want a pet that is awake during the day and enjoys cuddling, a hamster may not be the best fit.