I suspect this may be a mammal (probably a fox) caching food for later consumption. See the article in Discover Wildlife - scroll down to find the section on foxes.
https://www.discoverwildlife.com/how-to/identify-wildlife/how-to-identify-animal-food-stores
This is just my assumption, I have no personal knowledge
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Tony
My Flickr Photostream
Possibly a feral pheasant.