David Fleetham / Young boy getting ready to photograph Galapagos giant tortoise (Geochelone elephantopus). Santa Cruz Island, Galapagos Archipelago, Ecuador. Model released.

David Fleetham / Brown pelican (Pelecanus occidentalis) on nest tending its young, visible just beside the end of its beak. Santa Cruz Island, Galapagos Archipelago, Ecuador.

David Fleetham / Group of kayakers exploring the waters off Santa Cruz Island, Galapagos Archipelago, Ecuador. Model Released.

David Fleetham / Group of kayakers exploring the waters off Santa Cruz Island, Galapagos Archipelago, Ecuador. Model Released.

David Fleetham / Group of kayakers exploring the waters off Santa Cruz Island, Galapagos Archipelago, Ecuador. Model Released.

David Fleetham / Brown Pelican (Pelecanus occidentalis) in flight over Santa Cruz Island, Galapagos Archipelago, Ecuador.

David Fleetham / Adolescent Magnificent frigate bird (Fregata magnificens) in flight over Santa Cruz Island, Galapagos Archipelago, Ecuador.

David Fleetham / Galapagos sea lion (Zalophus californianus wollebacki) with mangroves behind. Santa Cruz Island, Galapagos Archipelago, Ecuador.

David Fleetham / Cattle egret (Bubulcus ibis) standing on back of a Galapagos giant tortoise (Geochelone elephantopus) in a grassy field on Santa Cruz Island, Galapagos Archipelago, Ecuador.

David Fleetham / Bravo clinid (Labrisomus dendriticus), Galapagos Archipelago.

Claudio Contreras / Galapagos Shark (Charcharhinus galapagensis), Roca Partida islet, Revillagigedo Archipelago Biosphere Reserve / Archipielago de Revillagigedo UNESCO Natural World Heritage Site (Socorro Islands), Paci...

Pete Oxford / Galapagos Green / Black Turtle (Chelonia mydas agassizi) off Wolf Island in the northern archipelago group of Galapagos, Ecuador, South America