Russian hamsters I have 4 that are about a month to a month and a half old. And two older ones, I don't know exactly how old, but I got two Russian ones, and two weeks later they had these four. The young ones are the most suitable for raising right now, they don't bite. I have two houses for them, both plastic (better than metal). And two balls, one for the young ones and one for the older ones in two sizes. Their food and new shavings are available.