Natural Fish Lure | Lampsilis Mussel and Bass

Description:  The Lapsillis mussel must spend part of its life cycle within the smallmouth bass.  It has evolved a lure that resembles a small fish so that it can squirt its young into the mouth of the bass.  The mussel is even able to twitch the lure as the bass approaches. 

Web Resources:  Natural Fish Lure, Absurd Creature of the Week - Wired