Probably not a thief, just an opportunist

[Mark_Riga]

Something has been nibbling some windfalls I think. Do these tooth marks help in identifying?
It seems to have quite deep holes in the flesh. May be 3 longish spaced out at the front?
When I saw 1/2 an apple on the ground, I thought it was a two legged visitor but the tooth marks don't look human.

[veggiechicken]

Is it Tooth or beak marks?
Blackbirds mostly here, knock them to the ground then something else comes along and nibbles them.

[burnie]

Wasps burrow into fruit as well

[Mark_Riga]

Well half an apple was missing and, having looked around, the damage looks very like this picture on internet. And badgers do go through the 'orchard' quite a lot.

twitter: https://twitter.com/JamesNaturalist/...13290834096128

[nickdub]

peck marks are birds (ragged edges) , and round ones on windfalls often slugs - wasps don't often start on fruit with whole skins, but they will move in if there's a mark or split they can use as an entry point , getting stung picking fruit full of wasps is a familiar hazard at this time of year.

[Snoop Puss]

A combination of blackbird doing the initial damage followed by a badger?

Also, we don't have apple trees, but our dogs will help themselves when to pears on our trees when they are ripe enough. They might leave canine marks in fruit that is still a bit hard and have a nibble before moving on to another one.