Thanks to its eight limbs, rounded head and bulging eyes; the octopus is considered by many to be a monster of the ocean. However, this extraordinary animal comes in all sizes and colors and is surrounded by mysteries that are sure to be much more interesting to you than its physical appearance.
For example, octopuses have three hearts: two of the hearts work exclusively to carry deoxygenated blood to the gills (the respiratory organs), and the third carries oxygenated blood to the rest of the body. Another very peculiar feature of octopuses is the way in which they defend themselves from their predators; When in danger, octopuses expel an ink that not only confuses the enemy but also irritates their eyes and alters their sense of taste and smell. This ink is so powerful that even the octopus itself must escape from it.
There are around 300 species of octopus, some as small as your little finger and others so large that they are capable of devouring young sharks. Some of them, like the Dumbo octopus, live in the depths of the sea, while others, like the common octopus, inhabit both surface and deep waters.