Is it possible to breed a rat and a hamster?

Unlike horses and ponies or zebras, you cannot breed a rat and a hamster. They are not the same species and are different enough that they cannot and would not breed. They won't even try, and if you put them in the same cage it is likely they will fight, maybe even kill one another. read more

In order for two living things to breed, they must be in the same species and/or have same amount of chromosomes. Each species has a set number of chromosomes that exist in pairs. A rat has 42, while Syrian hamster has 44 and Dwarf hamster has 28. read more