BBC Earth Science | Breeding a Baby Crab Army | Changing Planet: Coral Special | BBC Earth Science @BBCEarthScience | Uploaded 5 months ago | Updated 20 hours ago
As sea urchin populations decline, the algae they would consume is spreading, smothering corals and causing disease. Innovative researchers are on a mission to breed colossal numbers of another grazing animal, to step up and take over the urchins’ role.

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