Walnut

I went into the garden to pull up the Bog Garden area.
Smoochi has been digging like crazy to get in underneath it; she chased a lovely big Frog out of there the other day & I managed to save it, but I think it may have gone back there, so today was the day to pull it up & remove the 3 plants that were in there.
Anyway, while moving soil etc I spotted this......... green remains of the skin of a Walnut & a Walnut. 
The Squirrel's are t it again. Someone around here must have a Walnut Tree.