Re: Chewing hips?
That first thing is nothing to worry about, those patches are where his scent glands are. Male hamsters often lick and scratch those a lot while marking territory, so it's normal for some hair loss to occur.
Any animal has it's ups and downs, sure, it happens to females too, so long as he's not doing anything unhealthy and is sleeping enough there's no need to be worried that's he's more active.
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