Anybody want a walnut?

Here in eastern Nebraska black walnut trees commonly grow along the shorelines of lakes and ponds. On a quiet day I can hear squirrels chewing their way though the hard shells (much harder than English walnut shells) after making short work of the green outer hulls.

Canon T2i DSLR, Tamron 200-400mm lens at 390mm, f/6.1, 1/400th second, ISO 3200.

Cropped, sharpened.