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The Octopus | What Are Invertebrates | Invertebrates Definition

The smartest invertebrates

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.

Fun facts

  • Octopuses are the most intelligent invertebrate animals in the world.
  • For the octopus, lacking bones gives it a huge advantage, it can sneak into very small spaces.
  • The eight tentacles of the octopus are actually six arms and two legs covered with suckers.
  • The octopus’s lost limbs regenerate in a similar way to those of lizards.
  • The octopus may not be royalty, but he does have blue blood.
  • Octopuses change color to blend in with their surroundings and evade predators, as well as communicate with other octopuses.
  • The dens house the octopuses, which are usually built with rocks that push with their powerful limbs.
  • The mouth of the octopus resembles the beak of a chicken, it is used to tear and eat prey such as crabs and shellfish.


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