actually, yeah, he was in a cage with another adult hamster, i mean, they grew up together...but his cage was changed because the other one was too small, and i did this, maybe a month or two ago, well, a bit before snickers died, but Donovan was a female, and t.o. is a female i think, but i don't know because i can't hold him, so he could be a female...They never fought...but my dad hasn't turned the heat up in my room so i put sheets over his cage so he can sleep without being disturbed by the cold air, and i try to pull the sheets out from the bars and he get sooooo mad ad darts around the cage...hmmmm, maybe he's just mental...I am NEVER getting a dwarf hamster again!