Common octopus is the most famous Adriatic octopus specimen, the largest Adriatic cephalopod. There are many Croatian folk names for this type of which are the most common octopus, rowan, folfo, mushroom, praca, krakatica, petrovac, hljemac, etc. This octopus type is at the same time the most widespread in the world, and can be encountered in all the world's seas.

In the Adriatic it is widespread throughout the area where is not too much fresh water. The octopus boasts an excellent vision, a good memory, and is considered to possess a strong intelligence as well. Its color is variable and depends on the color of the environment. It has a special pigment in the body that creates different colors by clamping. Pigment can change brown, reddish, greenish, side, white, and can also create different patterns. It is also located at depths of up to 200 meters. They are mostly approaching the coast at the end of winter, and in the spring  when its time of mating. They do not withstand cold and quickly die in the cold.

Octopus is fed with all kinds of crabs, fish, cephalopods, shells, snails, and molasses. It attacks and eats its own kind. Still, crabs are her favorite food.

The meat of the female is delicious. Female differ from males by extremely large tentacles, but they have only a few tentacles and not on each arm.

Octopus has three hearts. Two small ones close to the branchiae that enrich the blood with oxygen and pump it to the big heart that transports it to the body. They have blue blood. No, blue blood does not mean that it is a royal origin, but only that it is not enriched with iron but copper, which enables them to better transmit oxygen in cold and less oxygen environments.