If the hamsters are young (like less that three months old) they will be playing (Unless you can see they are like ripping fur out of each other, you know use your common sense). If they are adults they will be fighting. Adult hamsters do fight. they should not be kept together unless for mating.
Boys have a yellow dot in the middle of their tummy.
guinea pigs are much larger
mice usually have long tails, hampsters have stumps
Um.. one has the reproductive organs of a male and one doesn't.
Their private area is different...if you go to google.com and type in diagram of a hamster then it will show up and show the difference between the two boy and girl.
Chances are, if it looks like your stereotypical hamster, it is a hamster. If it doesn't, it's a rabbit.
That is the same thing.
you can tell if your hamster is going to have babies if there belly is saggy and it is not getting much exercise.
It's very simple to tell if you have a dwarf hamster, because they are much smaller and more active.
What are you sayin WILD HAMSTER RAGE
i not sure...
If your hamster is noticably bigger, it is probably pregnant.