The extraordinary moment where hundreds of crabs protect a spy robot from one very hungry stingray.

Spy in the Ocean is available on iPlayer in the UK and will be available on PBS in the US in the autumn.

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#bbcearth #stingray #robots watch more:
Planet Earth http://bit.ly/PlanetEarthPlaylist
Blue Planet http://bit.ly/BluePlanetPlaylist
Planet Earth II http://bit.ly/PlanetEarthIIPlaylist
Planet Dinosaur https://bit.ly/PlanetDinosaurPlaylist

Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of entertaining and thought-provoking natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this.

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