When I looked closely I saw the fatty germ of the kernel was nibbled away and the starchy endosperm abandoned. I think the cardinals do this, and the squirrels. Not the blue jays; they'll stuff 5 or 6 whole kernels in their mouth and fly away with chipmunk cheeks! The smaller finches and wrens and black-capped chickadees and tufted titmice wait until the kernels are crushed and peck at the crumbs. I think.
Humans use diagrams; birds deduce on the fly.