Squids may not have catcalls, but they can signal to potential mates in another way—through brilliant changes to the color of their skin. Take that, peacocks.
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Key Facts In This Video
Most cephalopods lack external shells, and use their color-changing abilities to camouflage themselves for defense. 00:46
Some squid have light-reflecting cells called iridophores that can make their skin more or less iridescent. 01:23
Color changing in squids might be analogous to breathing in humans: a process that can be both controlled and automatic. 02:25