What is living in my tree?

[MagicKingdom]

Hello,
Just curious as to what sort of animal might be living in one of my apple trees. Thanks in advance.

Is it digging out the wood or just scratching about?
Could be anything small enough to get in there really! Probably a squirrel but might be a rabbit?

It might be stoats or weasels.

Could be a hedgehog ? Get a night time wildlife camera, they are so much fun. Then you will know .