Follow up to that squirrel and nut!
It's a hickory nut! I finally Googled, found this blog post about squirrels and hickory nuts: https://plantpostings.blogspot.com/2014/08/tree-following-nuts-nuts-everywhere.html And there's an awesome photo of a chipmunk with a huge hickory nut in its mouth on another web site, here (second photo): https://www.wiscontext.org/how-harvest-and-process-wisconsins-edible-tree-nuts Comments are off; I just wanted to do a quick bit of "research" and find out what the nut was. Peace.