OCTO

PUSES

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Where they live?

They live in all the world’s oceans but are especially abundant in warm, tropical waters. Octopuses, like their cousin, the squid, are often considered “monsters of the deep,” though some species, or types, occupy relatively shallow waters.

Most octopuses stay along the oceans floor, although some species are pelagic, which means they live near the water’s surface. Other octopus species live in deep, dark waters, rising from below at dawn and dusk to search for food. 

Crabs, shrims and lobsters rank among their favorite foods, though some can attack larger prey, like sharks. Octopuses typically drop down on their prey from above and, using powerful suctions that line their arms, pull the animal into their mouth.

The octopus performs its famous backward swim by blasting water through a muscular tube on the body called a siphon. Octopuses also crawl along the ocean’s floor, tucking their arms into small openings to search for food. 

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Trivias about octopuses eyes

No Blind Spot

Octopus eyes are structured in a way that eliminates blind spots, explains the University of California Berkeley

Dumbbell Pupils

Their pupils are shaped like dumbbells, acting as prisms to split white light into its color components, notes OctoNation. By changing the depth of their eyeballs, they can focus different colors on the retina

Colorblidness

While often described as colorblind, they can see shades of gray and even detect polarized light.  Their pupils are unique, resembling dumbbells, and can change shape to focus different wavelengths of light, effectively "seeing" color

Vision Adaptations

Octopus eyes are well-suited to their habitat and lifestyle, with the ability to quickly constrict the pupil in response to sudden light changes.

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Octopuses arms

Octopuses do not have tentacles; they have eight arms.Tentacles are elongated structures with suckers only at the end, while arms have suckers along their entire length. Squid and cuttlefish are cephalopods that possess eight arms and two feeding tentacles

The key difference lies in the distribution of suckers. Octopuses have suckers all along their eight arms, while tentacles (found in squid and cuttlefish) have suckers primarily at the end, clustered into a "tentacle club".

Sucker ganglion

Feeding. They use their arms to grab prey. 

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Each arm of an octopus is remarkably intelligent, with a degree of independence in its actions. They can move and grasp independently of the brain, with each arm essentially having its own "mini-brain".

They can sense chemicals and other stimuli through their arms.

Every octopus has eight arms, each with two rows of suction cups on the undersides.

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The octopus's flexible and intelligent limbs have inspired researchers in the field of robotics and prosthetics. The way their arms are controlled and the intricate details of their anatomy offer insights into creating more advanced prosthetics.