Who Made These Holes? | Outside My Window


Empty black walnut shell with holes (photos by Kate St. John)

This nutshell is empty and carved with large holes. Their shape and placement tells us who made them.

In the autumn black walnuts ripen and fall from the trees. They’re covered in yellow-green husks that exude a black stain when you open them.

Black walnut in husk, Schenley Park, 27 Sep 2019 (photo by Kate St. John)

Squirrels don’t care about the stain. They chew off the husk and gnaw the wooden shell.

Fox squirrel making the sawdust fly as he opens a black walnut (photo by Donna Foyle)
Fox squirrel chisels a black walnut (photo by Donna Foyle)

They make four holes, two on each side of the shell. The side that opens quickly is gnawed into one large hole. By their shape you can tell that a squirrel ate the nutmeat.

This fox squirrel gnawed a walnut in Donna Foyle’s backyard in 2014. Find out how long it took him in How To Open A Black Walnut.

(photos by Kate St. John and Donna Foyle, per the captions)