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12 Facts on Weird Marine Animal the Octopus

Octopuses are the intelligent invertebrates and often widely noticed. The weird arms of the octopus often are noticed around the globe. Octopuses are marine animal found in varied of marine habitat. There are 300 species of octopus found around the world.

Weird facts

1. Three Heart

Octopuses are well known for posing three hearts. Two hearts are used to pump the blood in the gills and one heart is used to pump blood through the body.

2. Blood

Unlike higher mammals that have the iron-rich pigment hemoglobin octopus has the copper-rich portion named Haemocyanin for the transfer of oxygen from the different parts of the body. Although it is considered less efficient than hemoglobin it works for octopus.

3. Maneuver

This is achieved by swimming or crawling under the water.

4. Speed

The speed of the octopus can reach up to 40 kilometers in an hour. But, this amount of speed does not last for longer period of time.

5. Arm

Octopus has the eight arms it means four pairs of the arm. Each arm has the suction cup.

6. Intelligent

Octopus are considered highly intelligent. The extents of octopus intelligent are highly debated among scientific community (1).

7. Diet

The predominant diet of the octopus comprises of crabs, squids, fish, etc. They are carnivorous hence feeds on other organisms.

8. Venom

Octopuses are equipped with the venom and the toxicity varies with the octopus species. Australia’s tiny blue-ringed octopus is equipped with deadly venom that can kill humans in minutes.

9. Life expectancy

Life expectancy varies with the species. Some species of the octopus can live for six months and other for five years.

10. Defense mechanism

The defense mechanism is the vital part of the octopus life. The primary means of disguise is by camouflage and mimicry. Camouflage is achieved by these of specializing cells like chromatophores, iridophores, and leucophores (2).

The injection of ink to disguise the predator is often carried out.

11. Reproduction

Female lays around 200 thousand eggs at once. Male often dies few months after mating.

12. Bilaterally symmetrical

When the octopus is cut in equal half both the half have are identical to each other. Scientifically it is known as bilaterally symmetrical.


1.     Stewart, Doug (1997). "Armed but not dangerous: Is the octopus really the invertebrate intellect of the sea". National Wildlife. 35 (2). 
2.     Meyers, Nadia. "Tales from the Cryptic: The Common Atlantic Octopus". Southeastern Regional Taxonomic Center. Retrieved 2 January 2017.


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