Brainy & Brainless Animals: Crash Course Zoology #5

Today 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. And what we’ll find is that sometimes it’s much smarter to have a tiny, simple brain than a big, complicated one! 🦔🐒🐝🐛🐘🐍🐀🐠 🐢🐋🐅🦓🦇🦜🐜🪱🦑 🦀🐊 Learn more about Rae here! ​​ Watch our videos and review your learning with the Crash Course App! Download here for Apple Devices: Download here for Android Devices: Crash Course is on Patreon! You can support us directly by signing up at Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever: Alexis B, Rene Duedam, Burt Humburg, Aziz, Nick, DAVID MORTON HUDSON, Per