The octopus mainly eats crabs and other shelled invertebrates, though they do eat fish and small sharks as well. The fact that they eat crabs primarily is the reason why an octopus has a beak. More »

Octopuses have muscular bodies that are usually composed of eight arms, a beak and a mantle. The octopus uses its arms to move in the water, to defend itself, to hunt and to mate. Octopuses eat and hunt with their beaks,... More »

Mimic octopuses typically eat small crustaceans and fish. They are usually found in muddy river bottoms and estuaries. The species was discovered in 1998, off the coast of Indonesia. More »

Predators of the octopus include eels, dolphins and sharks, among others. Octopi have many means of deterring predators, including the ability to detach an arm if it is in a predator's grasp and ink glands to release clo... More »

Predators of the blue-ringed octopus include gropers, moray eels, sharks and snappers. At just 5 to 7 inches in size, the species is an easy target for these larger fish that share its territory. More »

Some enemies of the octopus include eels, sharks, halibut, ling cod and dolphins. The octopus uses camouflage to protect itself from predators, which allows it to hide in plain sight. It also releases a cloud of black sm... More »

Though it breathes through gills, the octopus is not a fish but a cephalopod marine mollusk. Also, unlike a fish, an octopus is an invertebrate, which means it doesn't have a backbone. It also has three hearts. More »