Simplify the following text for a Grade 6 native English-speaking person.
Original: Wild hamsters live in the desert , but people all over the world keep domesticated hamsters as pets . There are four main types of hamsters : the Syrian hamster ( the kind most people have as pets ) , the Russian dwarf hamster , the Chinese hamster , and the Roborovski hamster .
Simplified: Other hamsters that are kept as pets are the four species of `` dwarf hamster '' .