They do. Seals, sharks, other large fish, whales, and eels prey on octopi. To avoid these predators, octopi have evolved to have a number of strategies. The ink they spray is meant to confuse predators and mask the octopus’ getaway. Some species can change color to match their surroundings, others have evolved dark patched that resemble eyes to confuse predators. Some species, such as the deadly blue-ringed octopus, use venom. A few species resemble fish or other objects. For example, the atlantic longarm octopus can mimic not only the appearance of a flouder, but also its distinctive swimming style.
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