San Esteban spiny-tailed iguana (Ctenosaura conspicuosa) on cardon cactus, Isla San Esteban, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Galapagos sea lion (Zalophus wollebaeki) underwater in the Galapagos Island Group, Ecuador. Pacific Ocean.

Sara Campbell world Champion freediver running freediving courses in Dahab. Egypt.

divers enjoying wreck diving in Barbados, Caribbean

Crew and guest on Zodiacs in the Atlantic Ocean from onboard the National Geographic Endeavour crossing the Atlantic Ocean from Lisbon, Portugal to Salvador, Brazil

The Lindblad expedition ship National Geographic Sea Lion staff diving off the sandstone cliffs at Isla San Jose, Gulf of California (Sea of Cortez), Mexico

Pilot whale (globicephala macrorynchus) A baby pilot whale upside down.Gulf of California.

Sara Campbell world Champion freediver running freediving courses in Dahab. Egypt.

Canoeists on the River Brathay near Ambleside, Lake District, Cumbria, England, United Kingdom, Europe

Crew and guest on Zodiacs in the Atlantic Ocean from onboard the National Geographic Endeavour crossing the Atlantic Ocean from Lisbon, Portugal to Salvador, Brazil

Closeup of the mildly toxic tentacles of the Upsidedown Jellyfish (Cassiopeia andromeda) which likes to inhabit shallow tropical lagoons. Red Sea.

Crew and guest on Zodiacs in the Atlantic Ocean from onboard the National Geographic Endeavour crossing the Atlantic Ocean from Lisbon, Portugal to Salvador, Brazil

Crew and guest on Zodiacs in the Atlantic Ocean from onboard the National Geographic Endeavour crossing the Atlantic Ocean from Lisbon, Portugal to Salvador, Brazil

Indonesia, Banda Sea, Banda Niera Island, Reef squid (sepioteuthis lessonia) at night.

Hawaii, Big Island, Kalapana, Black Brittle Starfish turned upside down on black sand.

Netherland Antilles, Bonaire, Brittle Starfish on tube sponge.

Indonesia, Banta Island, Oval squid (sepioteuthis lessonia) at night.

Hawaii, Maui, Ho'okipa, Alex Aguera in air above large crashing wave A10D

Hawaii, Maui, Ho'okipa, Alex Aguera airborne over huge wave,