Reef Manta (Manta alfredi) with a cleaner fish in its mouth. Fesdu island (Ari Atoll), Maledives. 10.01.1990
A reef manta ray at a cleaning station in Ari Atoll — these gentle giants with wingspans up to 18 feet circle in slow, graceful loops. This is the dive the Maldives is famous for. © Peter Geymayer, Public domain, via Wikimedia Commons

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