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.Know More
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
Female octopuses reproduce by first fertilizing their eggs with the sperm from a male and then depositing and caring for her eggs. The young octopuses, however, must care for themselves. They must secure food and avoid predators in order to grow, mature and eventually reproduce themselves.Full Answer >
Upon hatching, a baby octopus is referred to as "larva." After making their way to the ocean's surface, the larvae remain there for one to three months. They are defenseless at this point, and many become food for predators.Full Answer >
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 smoke to cover its escape if it is attacked by an enemy.Full Answer >
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 numbers of neurons located near their eyes and others inside their arms.Full Answer >