SciShow Explores Undersea Wars Where Crabs Defend Pacific Coral Reefs From Spiny, Venomous Crown-of-Thorns Starfish

SciShow host Michael Aranda explores wild undersea wars where little crabs defend Pacific coral reefs from big, spiny, and venomous crown-of-thorns starfish. The deadly and fascinating multiple-armed starfish are one of the largest sea stars in the world.