George Sanker / American Red Fox (Vulpes vulpes) portrait. Grand Teton National Park, Wyoming, June.

George Sanker / American Red Fox (Vulpes vulpes) running in Grand Teton National Park, Wyoming, June.

George Sanker / American Red Fox (Vulpes vulpes) stretching in a meadow of dandelions. Grand Teton National Park, Wyoming, June.

George Sanker / American Red Fox (Vulpes vulpes) sitting in grass. Grand Teton National Park, Wyoming, June.

George Sanker / American Red Fox (Vulpes vulpes) mother and cub with its mother in a meadow, Grand Teton National Park, Wyoming, June.

George Sanker / American Red Fox (Vulpes vulpes) cub running in a meadow , Grand Teton National Park, Wyoming, June.

George Sanker / American Red Fox (Vulpes vulpes) cub in a meadow full of dandelions. Grand Teton National Park, Wyoming, June.

George Sanker / American Red Fox (Vulpes vulpes) mother with four pups in a meadow, Grand Teton National Park, Wyoming, June 2008.

George Sanker / American Black Bear (Ursus americanus) cub. Yellowstone National Park, Wyoming, June.

George Sanker / American Black Bear (Ursus americanus) cub. Yellowstone National Park, Wyoming, June.

George Sanker / Moose (Alces alces) mother and baby crossing Gros Ventre River in the Grand Tetons. Grand Teton National Park, Wyoming, October.

George Sanker / American Red Fox (Vulpes vulpes) in grass. Yellowstone National Park, Wyoming, October.

George Sanker / Female American Black Bear (Ursus americanus) in meadow grasses. Yellowstone National Park, Wyoming, June.

George Sanker / Shoshone River in Shoshone National Forest. Wyoming, near the entrance to Yellowstone National Park, May 2006.

George Sanker / Bull Moose (Alces alces) in profile with antlers. Grand Teton National Park, Wyoming, October.

George Sanker / Mature Bighorn Rams (Ovis canadensis) on high mountain pass. Jasper National Park, Alberta, Canada, October.

George Sanker / Bull Elk (Cervus canadensis) resting by water. Autumn in Banff National Park, Alberta, Canada, October.

Gavin Hellier / The most famous of Lalibela's Rock Hewn churches, The Sunken Rock Hewn church of Bet Giyorgis, 'St. George', dating from the 12th Century, Lalibela and it's rock-hewn Churches rank among the greatest...

Gavin Hellier / Church of St Nikola and the Islands of St George and Gospa od Skrpjela, Perast, Bay of Kotorska, Montenegro, Balkans 2007

Gavin Hellier / Church of St Nikola and the Islands of St George and Gospa od Skrpjela, Perast, Bay of Kotorska, Montenegro, Balkans 2007

Gavin Hellier / St. David's lighthouse, 1879 red striped lighthouse standing 55ft tall, St George's Parish, Bermuda 2007

Gavin Hellier / St George's harbour in the historical town of St George, an UNESCO World Heritage Site, Bermuda 2007

Gavin Hellier / Elevated view at dusk over the harbour and white stone roofed pastel coloured buildings of historical town of St George, an UNESCO World Heritage Site, St George's Parish, Bermuda 2007

Gavin Hellier / Elevated view over the harbour and white stone roofed pastel coloured buildings of historical town of St George, an UNESCO World Heritage Site, St George's Parish, Bermuda 2007

Gavin Hellier / White stone roofs and pastel, traditional architecture of the historic town of St. George, an UNESCO World Heritage Site, St George's Parish, Bermuda 2007

Gavin Hellier / Typical Bermudian church and pastel architecture found in historical town of St George, an UNESCO World Heritage Site, Bermuda 2007

Gavin Hellier / Looking up at traditional chimney in historic town of St George, an UNESCO World Heritage Site, St George's Parish, Bermuda 2007

Gavin Hellier / White stone roofs and pastel architecture of the historic town of St. George, an UNESCO World Heritage Site, St George's Parish, Bermuda 2007

Gavin Hellier / Looking up at traditional chimney in historic town of St George, an UNESCO World Heritage Site, St George's Parish, Bermuda 2007

Gavin Hellier / Man on a scooter riding past white stone roofs and pastel architecture of the historic town of St. George, an UNESCO World Heritage Site, St George's Parish, Bermuda 2007

Gavin Hellier / Scooters for rental, St George, Bermuda 2007

Kirkendall-Spring / Upper Horsetail (Pony Falls), Columbia River George National Scenic Area, Oregon, USA, November 2010

Kirkendall-Spring / Triple Falls, Columbia River George National Scenic Area, Oregon, USA, November 2010

Kirkendall-Spring / Cascades below Wahkeena Falls, Columbia River George National Scenic Area, Oregon, USA, November 2010

Philippe Clement / The Osmington White Horse, the figure of George III on horseback sculpted in 1808 into the limestone on Osmington Hill along the Jurassic Coast, Dorset, UK, November 2012

Tui De Roy / Pinta Island tortoise (Chelonoidis nigra abingdoni) 'Lonesome George' the last Pinta Island tortoise, captive, which died June 2012, Pinta Island, Galapagos, July 2008

Tui De Roy / Pinta Island tortoise (Chelonoidis nigra abingdoni) 'Lonesome George' the last Pinta Island tortoise, captive, which died June 2012, Pinta Island, Galapagos, July 2008

Tui De Roy / Pinta Island tortoise (Chelonoidis nigra abingdoni) 'Lonesome George' the last Pinta Island tortoise, captive, which died June 2012, Pinta Island, Galapagos, July 2008

Tui De Roy / Pinta Island tortoise (Chelonoidis nigra abingdoni) 'Lonesome George' the last Pinta Island tortoise, captive, which died June 2012, Pinta Island, Galapagos, July 2008

Tui De Roy / Pinta Island tortoise (Chelonoidis nigra abingdoni) 'Lonesome George' the last Pinta Island tortoise, captive, which died June 2012, Pinta Island, Galapagos, July 2008

George Sanker / Red-shouldered hawk (Buteo lineatus) perched portrait, National Audubon Corkscrew Swamp Sanctuary, Florida, USA, April

George Sanker / Green heron (Butorides virescens) hunting for fish, feet gripping onto branch in balancing act, Everglades National Park, Florida, USA, March

George Sanker / Green heron (Butorides virescens) just after successful fish hunt, Everglades National Park, Florida, USA, March

George Sanker / Green heron (Butorides virescens) hunting for fish, Everglades National Park, Florida, USA, March

George Sanker / Snowy egret (Egretta thula) two in dispute, Everglades National Park, Florida, USA, March

George Sanker / Tricolored heron (Egretta tricolor) hunting in water, Everglades National Park, Florida, USA, March

George Sanker / Green heron (Butorides virescens) watching for fish, Everglades National Park, Florida, USA, March

George Sanker / Purple gallinule (Porphyrio martinica) feeding on waterlily bulb, Everglades National Park, Florida, USA, March

George Sanker / American alligator (Alligator mississippiensis) resting on log, Hillsborough River, Florida, USA

George Sanker / Purple gallinule (Porphyrio martinica) feeding on waterlily stem, Everglades National Park, Florida, USA, March

George Sanker / Black bellied whistling ducks (Dendrocygna autumnalis) group amongst aquatic vegetation, Hillsborough River, Florida, USA, April

George Sanker / American alligator (Alligator mississippiensis) walking into water, Myakka River State Park, Florida, USA

George Sanker / Sandhill crane (Grus canadensis) pair feeding in water, Myakka River State Park, Florida, USA, April

George Sanker / Sandhill crane (Grus canadensis) alongside Snowy egret (Egretta thula) in water, Myakka River State Park, Florida USA, April

George Sanker / Grey wolf (Canis lupus) swimming through flock of Canada Geese (Branta canadensis) at dawn in thick fog on the Yellowstone River, Yellowstone NP, Wyoming, USA

George Sanker / Herd of Bison (Bison bison) swimming across river, Yellowstone NP, Wyoming, USA

George Sanker / Coyote (Canis latrans) swallowing Uinta ground squirrel (Urocitellus armatus) prey, Yellowstone NP, Wyoming, USA

George Sanker / American alligator (Alligator mississippiensis) resting head on Red bellied turtle (Pseudemys rubriventris) Florida, USA

George Sanker / Elk (Cervus canadensis) bull portrait, Banff NP, Alberta, Canada

George Sanker / Silhouette of Common grackle (Quiscalus quiscala) at water, USA

George Sanker / Green heron (Butoroides virescens) perched, Hillsborough river SP, Florida, USA

George Sanker / Moose (Alces alces) bull moose in sleet, Grand Teton NP, Wyoming, USA, October

George Sanker / Grand Teton mountains reflected in lake, Grand Teton NP, Wyoming, USA, October 2009

George Sanker / Moose (Alces alces) two bull moose, Grand Teton NP, Wyoming, USA, October

George Sanker / Moose (Alces alces) bull bellowing, Grand Teton NP, Wyoming, USA, October

George Sanker / Moose (Alces alces) bull looking over vegetation, Grand Teton NP, Wyoming, USA, October

George Sanker / Grizzly bear (Ursus arctos horribilis) in long grass, Yellowstone NP, Wyoming, USA, October

George Sanker / Aspen trees (Populus tremula) in Grand Teton NP, Wyoming, USA, October 2009

George Sanker / Moose (Alces Alces) males fighting, clashing antlers at rut, Grand Teton NP, Wyoming, USA, October

George Sanker / Moose (Alces alces) female and male covered in light dusting of snow in forest, Grand Teton NP, Wyoming, USA, October

George Sanker / Oxbow bend in Snake River, Grand Teton NP, Wyoming, USA, October 2009

George Sanker / Grand Teton mountains reflected in Snake river, Grant Teton NP, Wyoming, USA, October 2009

George Sanker / Mule deer (Odocoileus hemionus) male browsing on vegetation in snowstorm, Yellowstone NP, Wyoming, USA, October

George Sanker / Least Chipmunk (Tamius minimus) feeding on the seeds of a thistle bush during a snowstorm, Grand Teton NP, Wyoming, USA, October

George Sanker / Mule deer (Odocoileus hemionus) two does in woodland, Grand Teton NP, Wyoming, USA, October

George Sanker / Bighorn sheep (Ovis canadensis) female and suckling young on mountain ledge, Yellowstone NP, Montana, USA, June

George Sanker / American pine marten (Martes americana) climbing tree, Yellowstone NP, Wyoming, USA, October

George Sanker / Northern / Hen harrier (Circus cyaneus) in flight mobbed by a Redwinged blackbird (Agelaius phoeniceus) Grand Teton NP, Wyoming, USA, June

George Sanker / Red fox (Vulpes vulpes) mother and cub, Shoshone NF, Wyoming, USA, May

George Sanker / Grizzly bear (Ursus arctos horribilis) sitting on rock, looking down, Yellowstone NP, Wyoming, USA, May

George Sanker / Coyote (Canis latrans) sniffing plant, Yellowstone NP, Wyoming, USA, October

George Sanker / Coyote (Canis latrans) running, Yellowstone NP, Wyoming, USA, October

George Sanker / Coyote (Canis latrans) sniffing the ground, looking up, Yellowstone NP, Wyoming, USA, October

Alex Mustard / Yellowbelly hamlet (Hypoplectrus aberrans) pair spawning at dusk with the fish in the foreground acting as male which may be a Shy/yellowbelly hamlet hybrid, George Town, Grand Cayman, Cayman Islands,...

Alex Mustard / Shy hamlets (Hypoplectrus guttavarius) pair spawning at dusk, George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Butter hamlet (Hypoplectrus unicolor) pair spawning at dusk, George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Butter hamlet (Hypoplectrus unicolor) pair spawning at dusk, George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Indigo hamlets (Hypoplectrus indigo) pair spawning at dusk, George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Barred hamlet (Hypoplectrus puella) pair spawning at dusk (long exposure used to produce blue background) George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Yellowbelly hamlet (Hypoplectrus aberrans) pair spawning at dusk (a long exposure 1/10th produced the blue background) George Town, Grand Cayman, Cayman Islands, British West Indies, Caribbean Sea.

Alex Mustard / Shy hamlet (Hypoplectrus guttavarius) pair spawning at dusk. Hamlets are one of the few vertebrate species that are true hermaphrodites, here the fish in the foreground is acting as a male, but this p...

George Sanker / Cottonwood trees (Populus sargentii) on the Lamar River, Yellowstone National Park, Wyoming, USA, October 2011

George Sanker / Grizzly bear (Ursus arctos horribilis) in long grass near water, Yellowstone National Park, Wyoming, USA, October

George Sanker / Grizzly bear (Ursus arctos horribilis) in grassland, Yellowstone National Park, Wyoming, USA, October

George Sanker / Least Chipmunk (Tamias minimus) sitting on tree stump feeding on dried grass seed, Yellowstone National Park, Wyoming, USA, October

George Sanker / Least Chipmunk (Tamias minimus) sitting on tree stump feeding on dried grass seed, Yellowstone National Park, Wyoming, USA, October