My wife is good at feeding squirrels. The first time I attempted the same thing I got bit in my thumb. Because of my lightning fast reaction I retracted my hand before he hit bone. Or actually my skin wasn’t even penetrated, he was just nibbling. But these guys can crack nut shells so I wasn’t going to wait and find out.
Notice the double squirrel action in this clip. I don’t know if both squirrel eats or just one of them.