Mary managed to outcompete the local squirrels to the tune of 10 pounds of Shagbark Hickory nuts, which we’ve been enjoying after supper. The thickly armored nuts shrug off ordinary nutcrackers, so we deploy heavy weaponry: good old 10WR Vise-Grip pliers:
She describes the process better than I; for what it’s worth, I work on one nut at a time. We both celebrate when a shell releases its nut with minimal damage; most often, we extract fragments into a pile like the one shown. I can process half a dozen nuts before deciding I’ve had enough.
I’d be in favor of a genetic modification producing a fluorescent green shell, because overlooking a minute piece of shell in that pile of nutmeat is a Very Bad Thing…
Some Vise-Grip history may be of interest.