How can a hungry school of fish help to create a thriving reef island? In this clip from the BBC’s The Blue Planet, neon-colored Humphead Parrotfish crunch rocks and hard corals alike as they forage for coralline algae.
According to a Maldives-based study in 2015, “parrotfish produced more than 85% of the new sand-grade sediment on the reefs around these reef islands.
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