Arcangeli's Pill Woodlouse Armadillidium arcangelii

Meet the ultimate escape artist — when threatened, these pill woodlice curl into a near-perfect ball, tucking their legs and antennae safely inside like tiny armored tanks. This "volvation" defense is so effective that they're often mistaken for pill millipedes, though they're actually crustaceans. One of 18 Armadillidium species worldwide, they're part of the diverse group known as roly-polies and pill bugs.