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 in Octopi
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 entices prey to come close to the animal.Full Answer >
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 >
The main predators of the Dumbo octopus are killer whales and sharks. Because Dumbo octopuses spend most of their lives at great depths, the species does not have many predators.Full Answer >
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.Full Answer >