Scientists may understand how the eye works, but seeing what other animals see is another matter entirely. Learn how eyes evolved, and find out which animal's eye biologist Tom Cronin would look through if he had the chance. ➡ Subscribe: http://bit.ly/NatGeoSubscribe About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible. Get More National Geographic: Official Site: http://bit.ly/NatGeoOfficialSite Facebook: http://bit.ly/FBNatGeo Twitter: http://bit.ly/NatGeoTwitter Instagram: http://bit.ly/NatGeoInsta Watch: How Animals and People See the World Differently | National Geographic https://youtu.be/6HWVgQdSTDQ National Geographic https://www.youtube.com/natgeo