Maldives, Baa Atoll - Joerg Blessing
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Parrotfish have fused teeth plates. With those they scrape polyps and algae of hard corals. In turn they excrete the coral skeleton as white sand. 
Baa Atoll, Maldives 2018

Parrotfish have fused teeth plates. With those they scrape polyps and algae of hard corals. In turn they excrete the coral skeleton as white sand.
Baa Atoll, Maldives 2018