We had a foxes skull on the window ledge outside the kitchen. I would often find the skull on the ground and assumed that the wind had moved it until one day last week I saw a squirrel sitting on the decking gnawing at the skull clenched in its paws. The following day I witnessed the little bugger trying to carry the skull off... I got it back and returned it to the window ledge.
Yesterday the squirrel got the skull as far as the top of the garden fence before I intervened.
Today the skull has gone. I presume it is up in a dray being gnawed at by a family of sniggering squirrels.