Judging by the overall size, number of toes and orientation of bones; Closest I can get is "a small rodent", probably a juvenile based on the lack of fur, and pink colour.

Most likely a Rat or a Squirrel, probably not a mole with those claws..

Just guesstimating here

Edit: Here's a picture of a baby Squirrel, those back feet look pretty similiar

https://www.vmcdn.ca/f/files/glaciermedia/import/lmp-all/40195-Wild-ARC-baby-squirrel.jpg

Definitely too short toes to be a Rat

Edit 2: My guess is that a bird snatched a baby Squirrel and either had to fight another bird for the loot and dropped some while they were at it, or the bird was interrupted while dining and dropped some of their meal while trying to relocate.