What are coral reefs? Coral can be found in tropical ocean waters around the world. But how much do you know about reefs and the tiny animals—polyps—that build them? Learn all about coral and why warming waters threaten the future of the reef ecosystem.
➡ Subscribe: http://bit.ly/NatGeoSubscribe

About National Geographic:
National Geographic is the world's premium destination for science, exploration, and adventure. Through their worldclass 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

Read more about Corals here:
https://on.natgeo.com/2Uo3q41

Coral Reefs 101 | National Geographic
   • Coral Reefs 101 | National Geographic  

National Geographic
   / natgeo