Alex Mustard / Reef manta (Mobula alfredi) visiting a cleaning station on a coral reef with a school of Onespot snappers (Lutjanus monostigma), Oriental sweetlips (Plectorhinchus vittatus) and Sabre squirrelfish (Sa...

Alex Mustard / Reef manta (Mobula alfredi) female swimming close to a coral reef, while cleaner wrasse (Labroides dimidiatus), tiny by comparison, pick parasites from her lips. Misool, Raja Ampat, West Papua, Indone...

Alex Mustard / Portrait of a large female Reef manta ray (Mobula alfredi) swimming over a coral reef. Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea. Tropical West Pacific Ocean.

Alex Mustard / Pair of large reef manta rays (Mobula alfredi) swim over a coral reef cleaning station. Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea. Tropical West Pacific Ocean.

Alex Mustard / Reef manta (Mobula alfredi) at a cleaning station with Cleaner wrasse (Labroides dimidiatus). South Ari Atoll, Maldives. Indian Ocean.

Alex Mustard / Reef manta (Mobula alfredi) swimming with Remoras (Remora remora). South Ari Atoll, Maldives. Indian Ocean.

Doug Perrine / Reef manta ray (Mobula alfredi) with Saddle wrasses (Thalassoma duperrey) and Hawaiian cleaner wrasses (Labroides phthirophagus) at cleaning station on coral reef, Keahole Point, North Kona, Hawaii Is...

David Fleetham / Reef manta rays (Mobula alfredi) feed over baskets of lights used to attract plankton at night, Kona Coast, Big Island, Hawaii, Pacific Ocean.

Russell Laman / Remoras (Echeneis naucrates) swimming on underside of Reef manta (Mobula alfredi), Raja Ampat, Indonesia, Pacific Ocean.

Russell Laman / Reef manta (Mobula alfredi) getting cleaned of parasites, dead skin, bacteria, and mucus by Blacklip butterflyfish (Chaetodon kleinii) and Moon wrasse (Thalassoma lunare) at a cleaning station in Raja...