Octopuses are mollusks, kind of animal with a soft body. Unlike other mollusks, such as clams and oysters, octopuses and squid have no hard ... (48) to protect them. An octopus is an animal without any bones. Surrounding the main portion of its body is a shy covering, called a mantle. Most of the internal organs of an octopus are inside the mantle. An octopus has two big ... set has very good vision. Seals, eels, and other sea animals prey on octopuses. An octopus main method of defense is to shoot a cloud of dark ink into the water. The ink cloud confuses the attacker, and the octopus jets away. Octopuses can also … color rapidly when they are in danger. They change color to fit in with their surroundings. This helps them to hide from prey.