68K views · 360 reactions | What happens when you lose a keystone species, like sea otters or kelp? Find out in "Extinction: The Facts,” now streaming on the PBS Video app. | PBS | Facebook
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3K views · 104 reactions | Ever wondered what a keystone species is and why they're so important? Keep watching to find out  Facts: National Geographic and Natural Resources Defense Council Starfish video: Héloïse Evans (https://bit.ly/3CXdPa9) Other videos: RSPB-images, Pexels and Pixabay | RSPB | Facebook
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