How to keep a hedgehog warm
Winter is the perfect time for lots of wild animals to get all nice and warm and cosy by hibernating - sleeping through the icy, cold weather.
But some animals that are meant to hibernate can't manage it.
The RSPCA animal charity say that they have to look after hundreds of hedgehogs who are either too weak or small to get their annual big sleep.
One animal hospital keeps them warm with "Snuggle Pads" - special pillows that can be warmed in a microwave.