Some octopuses like to stay in more shallow water where there are rocks and coral.
Because octopuses are invertebrates, meaning they don’t have backbones, they can squeeze
themselves into small spaces between the rocks to get out of reach of their predators. Another
way an octopus can hide is by shooting ink. An octopus uses a part of its body called a siphon
to shoot ink into the water. The ink forms a cloud that hides the octopus. By the time the ink
clears and the predator can see again, the octopus has swum away or hidden. It’s very much
like a magician doing a vanishing act.