Julie, in my experience males CAN be housed together so long as they have never mated with a female before.
if these animals have been donated, i would however keep them in separate quarentine cages for atleast 60 days to be sure none of them are sick.
if the males have ever been with a female, do not house them together.
when you put them together watch them closely to see if there is much aggression.
finally, monitor the health of the animals as time passes, even if you are not seeing them be aggressive towards one another, one may be stressing the other and causing it to lose weight.

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