Anup Shah / Family of Common zebra {Equus quagga} senior mare in front, stallion at rear, pass through throng of Wildebeest at start of migration, Moru, Serengeti NP, Tanzania

Ann & Steve Toon / Senior radio operator John Tanui, radio control room, Lewa Conservancy, Kenya, September 2012

LYNN M. STONE / Senior German Shepherd dog (age 13) in yard vegetation; Illinois, USA

LYNN M. STONE / Senior German Shepherd dog (age 13) in yard vegetation; Illinois, USA

LYNN M. STONE / Senior German Shepherd dog (age 13) in yard vegetation; Illinois, USA

Florian Möllers / PhD student Zarin Machanda (Harvard University) and senior field assistant Geresomu Muhumuza tasting bitter food items of chimpanzees (Pan troglodytes schweinfurthii). Budongo Forest Reserve, Masindi,...

Florian Möllers / Simon Townsend, PhD student (University of St. Andrews) and field assistant Monday Gideon, Zarin Machanda, PhD student (Harvard University) and Senior field assistant Geresomu Muhumuza observing chimp...

Florian Möllers / PhD student Zarin Machanda (Harvard University) and senior field assistant Geresomu Muhumuza recording behavioural data from chimpanzees (Pan troglodytes schweinfurthii). Budongo Forest Reserve, Masin...

Florian Möllers / Senior field assistant Geresomu Muhumuza recording indiviudal behavioural data of chimpanzees (Pan troglodytes schweinfurthii). Budongo Forest Reserve, Masindi, Uganda, Africa. December 2006

Flip Nicklin / Rockhopper Penguin (Eudyptes chrysocome) being photographed by tourists, Antarctica

Flip Nicklin / Gentoo Penguin (Pygoscelis papua) being photographed by tourists, Antarctica

Richard Herrmann / Photographer in desert during wet spring, Sonora, Mexico

Petra Wegner / Elderly women with Cavalier King Charles Spaniels on their laps as a form of pet therapy

Petra Wegner / Elderly woman with two Cavalier King Charles Spaniels - pet therapy

Petra Wegner / Elderly women with Cavalier King Charles Spaniel as pet therapy

Petra Wegner / Elderly woman with Blenheim Cavalier King Charles Spaniel on her lap for pet therapy

Petra Wegner / Elderly women with Cavalier King Charles Spaniels on their laps - a form of pet therapy

Petra Wegner / Elderly woman with Cavalier King Charles Spaniel for pet therapy

Petra Wegner / Elderly woman with Cavalier King Charles Spaniel on her lap as pet therapy

Petra Wegner / Elderly woman hugging a Cavalier King Charles Spaniel on her lap as pet therapy

Petra Wegner / Elderly woman with Blenheim, tan and black and tricolour Cavalier King Charles Spaniels as pet therapy

Petra Wegner / Elderly woman with Cavalier King Charles Spaniel as a form of pet therapy

Petra Wegner / Elderly woman with Cavalier King Charles Spaniel as pet therapy

Juergen Freund / Dr Billy Sinclair, Senior Lecturer at Central Queensland University, Rockhampton, observing nautilus swimming amidst red whip coral. Queensland, Australia.

Colin Monteath / Tourists cruise past iceberg, Dumont d'Urville, Terre Adelie Land, east Antarctica

Pete Oxford / African Lion (Panthera leo) watched by tourists, vulnerable, Africa

Pete Oxford / African Elephant (Loxodonta africana) herd at waterhole being watched by tourists, vulnerable, Africa

Pete Oxford / Blue-footed Booby (Sula nebouxii) pair on cliff observed by tourists in boat, Galapagos Islands, Ecuador

Pete Oxford / Marine Iguana (Amblyrhynchus cristatus) with tourists, vulnerable, Fernandina Island, Galapagos Islands, Ecuador

Pete Oxford / Marine Iguana (Amblyrhynchus cristatus) with tourists, vulnerable, Fernandina Island, Galapagos Islands, Ecuador

Pete Oxford / Masked Booby (Sula dactylatra) nesting colony observed by tourists from inflatable boat, Genovesa Island, Galapagos Islands, Ecuador

Pete Oxford / Masked Booby (Sula dactylatra) nesting colony observed by tourists from inflatable boat, Genovesa Island, Galapagos Islands, Ecuador

Pete Oxford / Los Gemelos or The Twins are two craters in the highlands of Santa Cruz Island, Galapagos Islands, Ecuador

Mitsuaki Iwago / Chimpanzee (Pan troglodytes) visited by Jane Goodall, Gombe Stream National Park, Tanzania

Mitsuaki Iwago / Chimpanzee (Pan troglodytes) in cage visited by Jane Goodall, Gombe Stream National Park, Tanzania

Pete Oxford / Close up portrait of seventy-four year old Rafael Changoluisa, a chagra or cowboy at a hacienda in the Andes Mountains, Ecuador

Gerry Ellis / Green Sea Turtle (Chelonia mydas) poached eggs being sold in market, Sabah, Borneo

Gerry Ellis / Elderly woman separating rice seed from husk, mountain village above Pokhara, Nepal

Michael & Patricia Fogden / Tourists in boat at Tortuguero Lodge National Park, Costa Rica

Tui De Roy / After 40 years on the island, Jacqueline De Roy still enjoys feeding fish scraps to Frigates and Pelicans, Academy Bay, Santa Cruz Island, Galapagos Islands, Ecuador

Tui De Roy / Masked Booby (Sula dactylatra) observed by tourists that frequently get in their way, Punta Suarez, Hood Island, Galapagos Islands, Ecuador

Jim Brandenburg / Red Deer (Cervus elaphus) antler velvet burnt of by man before it is used in medicinal soup that promotes long life, Hong Kong, China

Jim Brandenburg / Red Deer (Cervus elaphus) antler mixture prepared by man for medicinal soup that promotes long life, Hong Kong, China

Jim Brandenburg / Red Deer (Cervus elaphus) antler medicinal soup consumed by man, which is believed to promote long life, Hong Kong, China

Mitsuaki Iwago / Chimpanzee (Pan troglodytes) visited by Jane Goodall, Gombe Stream National Park, Tanzania

Michael & Patricia Fogden / Irula Tribe member and professional snake catcher for venom extraction, India

Mark Moffett / Leafcutter Ant (Atta capiguara) nest partially excavated near Sao Paulo, Brazil

Mark Moffett / Leafcutter Ant (Atta capiguara) nest partially excavated near Sao Paulo, Brazil

Juergen Freund / Dr. Jamie Seymour, senior lecturer at the School of Tropical Biology at James Cook University, Cairns, inspecting the contents of a beaker.

Mitsuaki Iwago / Native Aboriginal man, Australia

Flip Nicklin / Bottlenose Dolphin (Tursiops truncatus) vocalization readouts and sound looked at by Peter Tyack, senior scientist at Woods Hole Oceanographic Institution, Massachusetts

Patricio Robles Gil / San man peering out from shelter, Kalahari Desert, Africa

Jim Brandenburg / Senior warden Ted Goss of Department of Wildlife and Conservation, Rhinoceros Anti-poaching Unit, with his rangers many of whom are former poachers, Kenya

Mark Moffett / Tourists at the Iguacu Falls, world's largest waterfalls and the largest tourist attraction in the Atlantic Forest ecosystem, Brazil and Argentina border

Michael & Patricia Fogden / Members of the Irula tribe, catch snakes and extract their venom, India

Norbert Wu / Buddhist Monk and European tourists on beach at Phuket, Thailand

Mark Moffett / Montugary family serves tea, Deh Bala, Iran

Jim Brandenburg / Elderly man laughing, Harbin, China

Michio Hoshino / Athabaskan Indian woman, 112 years old, Alaska

Mark Moffett / Schoolgirls Vu Hong Nhung and Hang Thi Thu share their home with a stuffed deer, Tam Dao National Park, Vietnam

Mark Moffett / Village woman and children, concealing attire, must be worn in public by all women over the age of seven, Kaht, Iran