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Squids, octopuses or nautilus and cuttlefishes belong to molluscan class Cephaloda. These marine creatures are known for their bilateral body symmetry, bulging head and a set of tentacles. They are sometimes called inkfish since they have the ability to squirt ink. If you are fond of octopuses and squids, read on as we will continue to list fascinating facts about these cephalopods.

  • Octopuses and squids are confirmed to have the ability to edit their own genetic instructions. In fact, they do not follow the commands of their DNA at all.
  • They live in salt water no matter where they are – whether they are in tropics or mild zones.
  • Both squids and octopuses travel by "jet propulsion", a locomotion type that consumes more energy compared to tail propulsion used by fishes. In jet propulsion, a squid or octopus will suck water into and fill it into their muscular mantle cavity then expel the water via the siphon. It is a great way for cephalopods to travel quickly especially when going away from danger or jumping on to a prey.
  • Squids live in open seas while octopuses live in dens on the sea floor.
  • Squids have eight arms that have suckers and two specialized tentacles. These tentacles are used to catch preys. Octopuses have eight sucker-lined arms also used to capture preys and to move on the ocean floor.
  • Squids and octopuses have parrot-like beaks that are hard enough to kill and tear pieces of flesh from their prey.
  • Octopuses are overly sensitive to touch. However, they cannot differentiate heavy and light objects. They also have taste receptors all over their bodies and is up to 1,000 times more sensitive to taste compared to humans.
  • Squids and octopuses can camouflage by changing colors to blend with their surroundings. They can also exhaust dark cloud of ink to confuse predators which allows them time to escape.