Off the coast of a coral reef in the Red Sea, an octopus glides across a patch of rubble, eight arms probing every crack. A small entourage of reef fish follows close behind: goatfish hovering near ...

Octopuses typically have eight limbs that are called arms. Because the limbs have suction cups for its entire length, they are called arms instead of tentacles. Octopus arms can help the sea creatures ...