Things You Didn't Know About Squid

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Squids are mollusks with 10 arms, including two longer tentacles, and are known for their torpedo-shaped bodies

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They have a systemic heart that pumps oxygenated blood to the rest of their body, and two gill hearts that pump blood to their gills to get oxygen

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Squid are strong swimmers that use jet propulsion to move. They suck water into a siphon, then expel it out of the funnel in a fast, strong jet

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Squid have the largest eyes relative to their size of any animal. They have lenses over their eyes, which protect their eyes

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They can change their skin colour quickly using pigment-filled cells called chromatophores

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They use this to hide from danger, warn off attackers, or communicate with other squid

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Giant squid can regenerate their tentacles after injury, similar to octopuses

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Squid have an internal shell called a pen, or gladius, that stiffens the squid and provides attachment points for muscles

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