got 2 dwarf russions about 3 weeks ago. They were in the same cage and got on fine. Last weekend we've noticed that one of them (Pumpkin) is very aggressive against the other one (Inti) - don't ask...dd named them and names keep changing 
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No idea wheather they're male/female.
Today we noticed that Inti rolled up to sleep on one of the platforms in plain sight. I thought they like to cuddle into something/hide when going to sleep? Seems like Pumpkin has evicted her from the nest.
Any idea what might be a reason for this? We did enlarge/change the cage at the weekend so they have more space/running tubes etc.
We've offered Inti 'her' own nest (for the time being a refunctioned running wheel with nesting material and also have just put some material at the spot where she was curling up.
Not sure but she seems a bit under the weather and one leg might be a bit sore but she's walking on it.
Tempted to take her to the vet tomorrow. Problem there is she really doesn't like me and bites no matter how gently gently I approach - though puts up with dd and ds standing there and screeching... go figure! Kids are to small to handle hamsters on their own and dh doesn't get home till evening... So how do I get her into her travelling cage???
Ta