John Hooper Bowles, The Birds of Washington (Volume 1 of 2…
“ Clark’s ‘Crows’ have, like the Cross-bills, to get out the seeds from underneath the scaly coverings constituting the outward side of the fir-cone; nature has not given them [20] crossed mandibles to lever open the scales, but instead, feet and claws, that serve the purpose of hands, and a powerful bill like a small crowbar. To use the crowbar to advantage the cone needs steadying, or it would snap at the stem and fall ”
