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Octopuses have 2 eyes and 4 pairs of arms and are bilaterally symmetric. An octopus has a hard beak, with its mouth at the center point of the arms. Octopus lack an internal or external skeleton allowing them to squeeze through tight places. Octopuses are among the most intelligent and behaviorally flexible of all invertebrates.

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Blue Octopus. Just read "Soul of an Octopus" and enjoyed learning something about these intelligent, remarkable creatures.

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THE COCONUT OCTOPUS Photograph by Mario Neumann. Amphioctopus marginatus, also known as the coconut octopus or veined octopus, is a medium-sized cephalopod belonging to the genus Amphioctopus. It is found in tropical waters of the western Pacific Ocean

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75+ Beautiful Invertebrates That Live in the Ocean

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Mimic octpus,Thaumoctopus mimicus. "This animal is so intelligent that it is able to discern which dangerous sea creature to impersonate that will present the greatest threat to its current possible predator. For example, scientists observed that when the octopus was attacked by territorial damselfishes, it mimicked the banded sea snake, a known predator of damselfishes."

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Atlantic Pygmy Octopus (Small Egg Caribbean Pygmy Octopus) - Octopus joubini - In the order Octopoda, this is the smallest of octopus species, but not the smallest in the world, with an armspan of only 2-4" (5.08-10.16 cm). It lays elliptical amber eggs in a sheltered place. It is known to be intelligent creatures with keen senses, particularly sight - Image : © Jim Christensen

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Thinking in the Deep: Inside the Mind of an Octopus

In “Other Minds,” Peter Godfrey-Smith shows how the abilities of the octopus offer insight into the evolution of animal intelligence.