We know why it's called an anglerfish. But why wolf-trap? It has to do with the shape and mechanics of the fish's jaw. The upper jaw is three times larger than the lower jaw, and it is able to open and close sideways. When in the ventral position, the upper jaw combines with the lower jaw and forms a compartment in which prey is held just prior to being swallowed. Think of a Venus flytrap. Or, think of it as a wolf trap.
Thanks for the anglerfish, Theodosia and Chris.
Photo source: Cracked.com
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