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WhyReef - LifestyleLike squids and cuttlefish, the reef octopus is a cephalopod. That means it has a large head and many arms, or tentacles. During the day, it walks or swims over the reef and hunts. It is a very strong, aggressive predator. Though it doesn’t have bones, it is almost all muscle! It uses its tentacles to catch its prey. The suction-cups on its tentacles make it almost impossible for its prey to escape. When the octopus catches its prey, it jumps on top of it and then eats it with its sharp beak.