Octopuses only have one true brain, which is located in their head, wrapped around their esophagus. However, octopuses have other neurons, the cells that form the brain, in other places as well. Octopuses have large numb... More »

An octopus has eight legs, but they are more commonly referred to as tentacles. The name "octopus" is directly derived from the prefix "oct-" which means eight and is found in other words such as "octagon." More »

An octopus has two eyes, which have a very similar structure to human eyes. An octopus' eye contains a retina, cornea, iris and lens, which provide the octopus with excellent vision, especially for an invertebrate. More »

The mouth of an octopus is located on the lower side of its head. The mouth is shaped like a beak and conceals a toothed tongue called a radula, which is used for scraping and shearing food. The bite of an octopus can be... 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 »

An octopus' coloration depends upon its surroundings. An octopus possesses the ability to alter its coloration depending on its immediate environment. This defensive technique protects the animal from predators and entic... 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 »