The blue-ringed octopus flashes its 50-60 rings within a third of a second as a warning display to predators. Being one of the world's most venomous marine animals, its poison causes total body paralysis—also to humans.

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Blue-Ringed Octopus

Cuttlefish have three hearts! One that pumps blood around the body and two pumping blood to the gills.

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Broadclub Cuttlefish

The tapered head of a hawksbill ends in a sharp point resembling a bird's beak, hence its name.