WEBVTT

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Oooh. Yeah, squid.

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So we were just talking a little bit about the ways that cephalopods can change color using their chromatophore organs,

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which are elastic pigment sacks in the skin and they can retract and extend the muscles surrounding those sacks of pigment and 

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cause the pigment to extend or retract itself and you'll either see the pinpoint of color or you'll see it expanded

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and that's how they are getting this reddish color, from reddish to pale and back again rapidly.

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The reason that cephalopods use color changing is for communication.

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In reproductive behavior, they'll have particular color patterns that males indicate to females that they're interested in mating and 

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the females communicate back to them that they are or are not.

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The other major reason that cephalopods use color changing in their skin is as a form of camouflage. 

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Wow. That's beautiful.