Claudio Contreras / American crocodile (Crocodylus acutus) extreme close up with jaws open, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Pascal Kobeh / Long-snouted seahorse (Hippocampus guttulatus) with prehensile tail twined round seagrass, Etang de Thau Lagoons, Languedoc-Roussillon, France.

Cheryl-Samantha Owen / Looking down on sea grass, Aldabra Atoll, Seychelles, Indian Ocean

Alex Mustard / 2020VISION / A captive Yellow / Spiny seahorse (Hippocampus guttulatus) attached to plastic seagrass, Weymouth Sealife Centre, Dorset, England, UK.

Juergen Freund / Dugong (Dugong dugon) in the seagrass bed shadowed by a trevally. Dimakya Island, Palawan, Philippines

Juergen Freund / Diver watching a swimming Dugong (Dugong dugon). Dimakya Island, Palawan, Philippines, April 2010.

Juergen Freund / Split-level shot of a pet baby Hawksbill turtle (Eretmochelys imbricata) swimming in the shallows. Tunnung Island, New Hanover, Papua New Guinea, June 2010.

Alex Mustard / A young Spiny / Yellow / Longsnouted Seahorse (Hippocampus guttulatus), in an aquarium attached to plastic seagrass leaves. This seahorse is part of a UK seahorse breeding program. Photographed at the...

Alex Mustard / A Leafy Seadragon (Phycodurus eques) swims over a seagrass bed. Wool Bay Jetty, Edithburgh, Yorke Peninsular, South Australia, November.

Alex Mustard / A male Spiny Seahorse (Hippocampus guttulatus) hides in seagrass. Etang De Thau (Thau Lagoon), Montpellier, France, Europe, September.

Juergen Freund / Dugong (Dugong dugon) feeding in the seagrass bed with trevally fish inspecting the disturbed sand. Dimakya Island, Palawan, Philippines

Onne van der Wal / Young man snorkeling over seagrass bed, holding a starfish, The Grenadines, Caribbean. February 2010, Model released.