Are Hamsters Or Guinea Pigs Bigger. Guinea pigs are usually much bigger than hamsters and need a larger cage. If those two species live together you should be aware of the fact that rabbits can hurt or even kill the guinea pig.
While both are small, hamsters are smaller and more solitary. Guinea pigs also don’t need a wheel in their cage as this is highly dangerous for them. But, to an animal lover the difference between hamster and guinea pig is quite clear.