Octopuses: Brains in Their Arms

Octopuses literally think with their arms. These boneless geniuses have the largest

brains of any invertebrate because their neurons are spread out through their tentacles. This means their

limbs can solve problems on their own while the main brain handles the big stuff.

They are master shapeshifters that use special skin cells to change color instantly

for camouflage or just to show how they feel. If they get caught, they pull a wild

move called autotomy where they detach their own arm to distract a predator. The arm keeps twitching

while they escape, and they just grow a fresh one later.