Jeff Rotman / Gorgonian Seafan Coral (Gorgonacea) polyps open to feed at night. South China Sea, Sipadan Island, Borneo.

Juergen Freund / Green turtles (Chelonia mydas) mating over coral reef, Sipadan Island, Sabah, Malaysia, June, Endangered species

Juergen Freund / Green turtle (Chelonia mydas) with schooling Bigeye jacks / trevally (Cranax sexfasciatus). Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Green sea turtle (Chelonia mydas) resting in a crevice in the coral reef. Sipadan Island, Semporna, Sabah, Malaysia, June

Juergen Freund / Green turtle (Chelonia mydas) swimming near the surface in the reef shallows. Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Mating pair of Green turtles (Chelonia mydas) in the reef shallows. Sipadan Island, Sabah, Malaysia. June

Juergen Freund / Mating Green turtles (Chelonia mydas) in the reef shallows. Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Split-level shot of Green turtle (Chelonia mydas) in the reef shallows, swimming towards the camera. Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Split-level shot of mating pair of Green turtles (Chelonia mydas) in the reef shallows. Sipadan Island, Sabah, Malaysia, June

Juergen Freund / Green turtle (Chelonia mydas) seen from above, swimming away from the camera. Sipadan Island, Semporna, Sabah, Malaysia, June

Juergen Freund / Large schooling Bumphead parrotfish (Bolbometopon muricatum) with a passing Hawksbill turtle (Eretmochelys imbricata). Sipadan Island, Sabah, Malaysia

Juergen Freund / Split level shot of mating Green turtles (Chelonia mydas) in the reef shallows. Sipadan Island, Sabah, Malaysia, June