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Small tortoiseshells in the house

For the 3rd time in the last 4 weeks I've found a small tortoiseshell butterfly in the house.  They're always pretty docile - alive, but easy to handle without damaging and making no attempt to fly away. It's almost as if they're hibernating but it's surely far too early (the first time was late August).  They're not flying around when I find them, usually just perched on a wall. I take them outside and leave them somewhere sheltered. 

Anyone have an idea why they might be coming indoors?  Hibernating this early?


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