What does "snapping" mean?

Snapping: a. & n. from Snap, v. Snapping beetle. (Zoöl.) See Snap beetle, under Snap. -- Snapping turtle. (Zoöl.) (a) A large and voracious aquatic turtle (Chelydra serpentina) common in the fresh waters of the United States; -- so called from its habit of seizing its prey by a snap of its jaws. Called also mud turtle. (b) See Alligator snapper, under Alligator.