It's very hard to kill a purple sea urchin. Starve it for years, and it will fall dormant on the ocean floor, devoid of any flesh — just an empty, spiky shell awaiting its next meal. They're like the ...
The Pacific purple sea urchin's appetite for kelp threatens marine ecosystems along the California coast as it ravages the "lungs of the ocean."... Transforming the 'Roombas of the ocean' into ...
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