7. Octopuses Octopuses are eight-armed animals that live on the ocean floor. They have a soft body and two rows of arms which they use for catching prey. If an octopus loses an arm, eventually it will grow back. To escape predators, octopuses squirt black ink into the water or camouflaging by changing their skin color to blend into the background. Octopuses swim by spewing water from its body, creating a jet propulsion.