The Ochre Sea Star. A remarkable predator that can turn its stomach inside out through its mouth. And is also central to the story of a highly influential concept in ecology: it is the original Keystone Species ...

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Music

Opening & Closing Themes: Running Waters and Acoustic Meditation by Audionautix (Jason Shaw), from audionautix.com. CC BY 3.0.

Modified versions of: Clothe the Fields With Plenty by Axletree, CC BY 4.0; Prelude No. 21, Prelude No. 18, Prelude No. 20 and Prelude No. 13 by Chris Zabriskie, CC BY 3.0