Starfish Eyes, Octopus Blood, and Human Evolution in Action

You’re probably aware that nature has come up with some pretty fascinating animal adaptations over the millennia, and in general, the stranger the adaptation, the more important it is to that organism. Today on SciShow News, Hank has some new discoveries about weird adaptations to report on (including one in humans!), along with the reasons they evolved the ways they did.

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Sources
https://en.wikipedia.org/wiki/Visual_system
http://www.sebiology.org/