Parasites can mimic their host’s natural prey, gaining a pathway into the host when consumed. Leucochloridium, a genus of flatworm, matures in the digestive system of songbirds. Their eggs pass in the bird’s feces, which are eaten by snails. Since songbirds do not eat snails, the sporocyst-sac evolved to pulsate brightly in the snail’s eye stalk, attracting hungry songbirds and completing the cycle.
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