Every Animal That Can Survive Without a Head

A cockroach lives for a week without its head. A chicken named Mike survived 18 months. And at the bottom of a pond, a tiny creature called the Hydra regrows its entire nervous system from scratch — then lives forever.This is the biology of survival without a brain — 12 animals that function, hunt, mate, and regenerate with no head attached. From the planarian flatworm that remembers everything after being cut in half, to the sea slug that decapitates itself on purpose and crawls away, to the Hydra that cannot die of old age.