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.Continue Reading
The octopus is considered a mollusk because it has a mantle that holds the organs it uses for breathing and excretion and has a rasping tongue, or radula. The octopus also shares features of its nervous system with other mollusks. It has no bones, and the hardest part of its body is its beak.
The octopus is also a cephalopod because its large head is merged with its arms.Learn more about Octopi
There is no term for a group of octopus, as the mollusks are solitary, according to the Vancouver Aquarium. While some species of squid, another type of mollusk, live in schools when young, the octopus lives alone in underwater dens its entire life.Full Answer >
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."Full Answer >
Sharks, killer whales and tuna are the main eaters of the dumbo octopus. Since it spends much of its life at depths ranging from 1,300 feet to more than 20,000 feet, the octopus does not have many predators.Full Answer >
The octopus inhabits the water along several coastal regions in temperate, subtropical and tropical areas, including alongside the western coast of Africa, the Gulf of Mexico and India. The creature is part of the mollusk family and is related to the squid. As an invertebrate, it has no skeletal structure.Full Answer >