Alan Murphy / Green Jay (Cyanocorax yncas) calling, Texas

Pete Oxford / Red-footed Booby (Sula sula) flying juvenile being photographed by tourist, Genovesa Island, Galapagos Islands, Ecuador

Pete Oxford / Galapagos Sea Lion (Zalophus wollebaeki) pup and tourist, Galapagos Islands, Ecuador

Pete Oxford / Marine Iguana (Amblyrhynchus cristatus) group photographed by tourist, Fernandina Island, Galapagos Islands, Ecuador

Thomas Marent / African Elephant (Loxodonta africana) crossing dirt road near tourists, Serengeti National Park, Tanzania

Juan Carlos Munoz / Iberian black pig in oak woodland, Sierra de Aracena Natural Park, Huelva, Andalucia, Spain, Europe. Breed used to produce Iberico ham / Jamon Iberico

Juan Carlos Munoz / Iberian black pig foraging in oak woodland, Sierra de Aracena Natural Park, Huelva, Andalucia, Spain, Europe. Breed used to produce Iberico ham / Jamon Iberico

Bence Mate / Green / Double-crested basilisk (Basiliscus plumifrons) running across water surface, Santa Rita, Costa Rica

Staffan Widstrand / Kayaking past icebergs in Svalbard, Norway, July 2011. Model released.

Mark Carwardine / Whale shark (Rhincodon typus) aerial view of juvenile with two people swimming alongside, La Paz Bay, Sea of Cortez (Gulf of California), Baja California, Mexico, March 2009

Mark Carwardine / Hands of a tourist leaning from boat to touch the mouth of a friendly Grey whale (Eschrichtius robustus) lying on the surface, San Ignacio Lagoon, Baja California, Mexico, April 2009

Mark Carwardine / Split-level of tourist in small boat leaning out to touch a Grey whale (Eschrichtius robustus) San Ignacio Lagoon, Baja California, Mexico, April 2009