Original unsigned drawings for illustrations of crow beak versatility, p. 41 of book "In the Company of Crows and Ravens," Marzluff & Angell, Yale Univ. Press, 2005.
"Their stout all-purpose bills are often likened to Swiss Army knives, because they can cut, tear, crush, gape, probe, rip, and open just about anything …" (pp. 40-41)