Determining the sex of hamsters can be hard especially if the hamsters are young or are all of one gender. (Testicles are only noticeable at about 4 weeks of age and they can be retracted)
However, the genital opening of the male hamster is farther away from the butt, almost in the position where you'd expect his belly button to be. The female has a genital opening right above the butt.
If the genital opening is almost indistinguishable from the butt, than your hamster is definitely a girl. If the genital opening is farther away (about half an inch) than it is a boy.
Another way to tell is to flip the hamster over and see if you can find nipples. Only females will have these.
However, the genital opening of the male hamster is farther away from the butt, almost in the position where you'd expect his belly button to be. The female has a genital opening right above the butt.
If the genital opening is almost indistinguishable from the butt, than your hamster is definitely a girl. If the genital opening is farther away (about half an inch) than it is a boy.
Another way to tell is to flip the hamster over and see if you can find nipples. Only females will have these.