Shane P. White / Leatherback Sea Turtle (Dermochelys coriacea) female returning to sea after egg laying, Trinidad and Tobago, Caribbean

Ralph Pace / Green Sea Turtle (Chelonia mydas), San Diego, California

Ralph Pace / Olive Ridley Sea Turtle (Lepidochelys olivacea) females coming ashore to nest during arribada, Playa de Escobilla Sanctuary, Oaxaca, Mexico

Jeff Foott / Collared Lizard (Crotaphytus collaris) male basking, Arches National Park, Utah

Shane P. White / Leatherback Sea Turtle (Dermochelys coriacea) females laying eggs on beach at sunset, Trinidad and Tobago, Caribbean

David Fleetham / Silhouette of a Green Sea Turtle (Chelonia mydas) passes overhead. West Maui, Hawaii.

David Fleetham / Green Sea Turtles (Chelonia mydas) gathering at a cleaning station off where small fish will remove their parasites. West Maui, Hawaii.

David Fleetham / Green Sea Turtle (Chelonia mydas) below surf instructor Tara Angioletti on a stand-up paddle board off Canoe Bearch, Maui, Hawaii. Model released.

David Fleetham / Green turtle (Chelonia mydas) swimming towards surface, Hawaii.

Tui De Roy / Marine Iguana (Amblyrhynchus cristatus) pair basking, Academy Bay, Santa Cruz Island, Galapagos Islands, Ecuador

Silke Arndt / Western rattlesnake (Crotalus viridis viridis), threat display, South Dakota, USA, September.

John Cancalosi / Western diamondback rattlesnake (Crotalus atrox), defensive rattling, Arizona, USA, April.