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Crash Course Zoology
Brainy & Brainless Animals
Season 1
Episode 5
We're going to take a closer look at brains, how animals use them, and how some animals have even evolved to lose them! It turns out a brain (and intelligence more broadly) isn't easy to define, but what we do know for sure is that brains have evolved over time in response to the challenges in an animals' environment.
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14:56
So what is an animal anyway?