Snails attack with their shells

Researchers discovered snail species that use their shells to hit predators. Snails were thought to withdraw into their shells when attacked, but land snail species Karaftohelix gainesi and Karaftohelix selskii manifest an active defence behaviour, counterattacking predators by swinging their shells. Credit: Parallel evolution of passive and active defence in land snails Yuta Morii, Larisa Prozorova & Satoshi Chiba Scientific Reports doi: