List of incredibly dangerous parasites starts with Leucochloridium paradoxum – these flatworm’s eggs when eaten accidentally by a snail, the parasite develops in the gastropod’s body and fills the eye stalks with the sack of larvae. The snail’s stalk appears wriggle resembling little caterpillars. The birds get attracted thinking it’s a caterpillar and that’s the next stage of the parasite to move on to its next life-cycle. The infected snail heads out to the open. Even if it manages to survive one assassination attempt, the parasite filled stalk will grow back and will make it prone to further such attacks.