Jeff Rotman / Common Thresher Shark (Alopias vulpinus) caught on gill net being hauled up onto boat, Huatabampo, Mexico, Sea of Cortez, Pacific Ocean. Model released. Model released.

Patricio Robles Gil / Silhouetted Capivara / Capibara (Hydrochoerus hydrochaeris) with Cattle Tyrant (Machetornis rixosa), which feeds on flies approaching the Capibara. Parana, Southern Brazil.

Patricio Robles Gil / Pale-legged Hornero (Furnarius leucopus) male and female birds building their mud nest on a branch. Parana, Southern Brazil.

Patricio Robles Gil / "Male Baja California / Peninsular pronghorn (Antilocapra americana peninsularis) vocalising, semicaptive breeding facility, Biosphere Reserva of El Vizcano, Baja, Mexico, Critically endangered subspe...

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) male dissapearing into nest hole in tree, El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) male at entrance to nest hole in tree, showing very long tail feathers, cloud forest El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico

Patricio Robles Gil / Aerial view of coastal waters, Baja California, Mexico, April 2008

Patricio Robles Gil / Rear view of male Himalayan monal pheasant (Lophophorus impejanus) on rock, Sagarmatha National Park, Himalayas, Nepal, December

Patricio Robles Gil / Aerial view of Llano de Cachigui with water rivulets following heavy rain, Baja California, Mexico, April 2008

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) male perched, El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) male at nest hole in tree, El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico

Patricio Robles Gil / Resplendent quetzal (Pharomachrus mocinno) male at nest hole in tree, El Triunfo biosphere reserve, Sierra Madre del Sur, Chiapas, Mexico

Patricio Robles Gil / Ancient cave paintings of people, deer and wild sheep, Sierra de San Francisco, Baja California, Mexico

Patricio Robles Gil / Aerial view of Gorely volcano (1,829m) with snow on slopes, Kamchatka, Russia, August 2006

Patricio Robles Gil / Brown bear (Ursus arctos) sitting, captive, Seoul Zoo

Patricio Robles Gil / Two male Moose (Alces alces) in lake, one drinking, silhouetted, Gran Teton National Park, Wyoming, USA, October

Patricio Robles Gil / Tree covered in snow after blizzard, Wyoming, USA, January 2008

Patricio Robles Gil / Bighorn sheep (Ovis canadensis) ram grazing in snow, Wind River Range, Wyoming, USA, January

Patricio Robles Gil / Common peafowl {Pavo cristatus} male peacock perched in tree, Royal Chitwan NP, Nepal

Patricio Robles Gil / Common peafowl {Pavo cristatus} silhouetted male peacock perched in tree in early morning mist, Royal Chitwan NP, Nepal

Patricio Robles Gil / Common peafowl {Pavo cristatus} male peacock in flight, Royal Chitwan NP, Nepal

Patricio Robles Gil / Common peafowl {Pavo cristatus} male peacock in flight, Royal Chitwan NP, Nepal

Patricio Robles Gil / Coyote (Canis latrans) walking over snow, Yellowstone NP, Wyoming, USA, October

Patricio Robles Gil / Great tailed grackle (Quiscalus mexicanus) in water, Yucatan, Mexico

Patricio Robles Gil / Matador in final stages of bullfight leaps over bull to pierce bull between horns with blade, Plaza de Toros, Mexico City, Mexico Sequence

Patricio Robles Gil / Barrel cactus (Ferocactus pilosus) Chihuahuan desert, Mexico

Patricio Robles Gil / Silverberry River, Backbone Range, Mackenzie Mountains, Northwest Territories, Canada

Patricio Robles Gil / Six young Impala {Aepyceros melampus} running down road in Kruger NP, South Africa

Patricio Robles Gil / Silhouette of young Gelada baboons (Theropitecus gelada) playing in tree at dawn, Simien Mountains NP, Ethiopia

Patricio Robles Gil / Silhouette of Gelada baboon (Theropitecus gelada) climbing steep cliff, Simien Mountains NP, Ethiopia

Patricio Robles Gil / River flowing through desert cliffs, Sierra del Carmen region, Coahuila, Mexico

Patricio Robles Gil / Lightning storm at night over the Sierra del Carmen range, Mexico

Patricio Robles Gil / Tien Shan Mountain landscape, Kyrgyzstan

Patricio Robles Gil / Fiji Crested Iguana (Brachylophus vitiensis) beside Heliconia, endemic to Fiji and Tonga

Patricio Robles Gil / Yasur Volcano erupting, Tana Island, Vanuatu Archipelago, New Hebrides

Patricio Robles Gil / Young boys charcoal mining in the Indo-Burma hot spot

Patricio Robles Gil / Gambel's Quail (Callipepla gambelii) adult perched atop a blooming cactus, El Pinacate/Gran Desierto de Altar Biosphere Reserve, Sonora, Mexico

Patricio Robles Gil / Olive Ridley Sea Turtle (Lepidochelys olivacea) hatchling being released, Pacific Ocean, Oaxaca, Mexico

Patricio Robles Gil / Monarch (Danaus plexippus) butterfly, mass flying in wintering grounds, Monarch butterfly Biosphere Reserve, Michoacan, Mexico

Patricio Robles Gil / African forest elephant {Loxodonta cyclotis} with trunk raised, Loango National Park, Gabon

Patricio Robles Gil / Australian gannet nesting colony {Morus / Sula serrator}. Muriwai, North Island, New Zealand.

Patricio Robles Gil / African Pygmy Elephant (Loxodonta pumilio) vocalizing with trunk raised, Petit Loango National Park, Gabon, western Africa

Patricio Robles Gil / Sea Star on rocky beach, Baja California, Mexico

Patricio Robles Gil / Cardon (Pachycereus pringlei) cactus, Esp?ritu Santo Island, Gulf of California, Mexico

Patricio Robles Gil / St. Elias Mountains, Kluane National Park, Canada

Patricio Robles Gil / Glacier, St. Elias Mountain, Kluane National Park, Canada

Patricio Robles Gil / Blue-footed Booby (Sula nebouxii) perched on rocks and cactus on San Pedro Martir Island, Gulf of California, Mexico

Patricio Robles Gil / Blue Whale (Balaenoptera musculus) aerial view of mother and calf swimming near the surface in the Gulf of California, Mexico

Patricio Robles Gil / Cardon (Pachycereus pringlei) cactus and flowering Common Morning Glory (Ipomoea purpurea) vines in the Miquihuana Desert, northeast Mexico

Patricio Robles Gil / Guayalejo River flowing through cloud forest, Tamaulipas, Sierra Madre Oriental, northeast Mexico

Patricio Robles Gil / Fog rolling over cloud forest, Altas Cumbres Protected Area, Tamaulipas, Sierra Madre Oriental, northeast Mexico

Patricio Robles Gil / Aerial view of Tamul Waterfall (330 feet high) where Rio Gallinas cascades into the Rio Santa Maria river in the Huasteca Potosina region, Mexico

Patricio Robles Gil / Atlantic Walrus (Odobenus rosmarus rosmarus) resting on ice, Spitsbergen, Svalbard, Norway

Patricio Robles Gil / Semi-aquatic communities of Water Lilies in a wetland near the Tamesi River, south Tamaulipas, Mexico

Patricio Robles Gil / Accumulated rainwater on a Mafafa leaf in El Cielo Biosphere Reserve in the mountains of the Sierra Madre Oriental, Tamaulipas, northeast Mexico

Patricio Robles Gil / Asian Elephant (Elephas maximus) herd drinking from river, Nagarhole National Park, Karnataka, India

Patricio Robles Gil / Aboriginal man with his face painted for the Mt Hagen cultural show, Papua New Guinea

Patricio Robles Gil / Aboriginal man wearing tribal headdress costume for the Mt Hagen cultural show, Papua New Guinea

Patricio Robles Gil / Aboriginal man wearing tribal headdress made with feathers from Bird-of-Paradise, Parrots and Lorikeets, Papua New Guinea

Igor Shpilenok / Photographer Patricio Robles Gil reviewing his work with a West Caucasian tur (Capra caucasica) behind him. Kabardino-Balkarsky Nature Reserve, Caucasus Region of Russia.

Igor Shpilenok / Photographer Patricio Robles Gil reviewing his work with a West Caucasian tur (Capra caucasica) behind him looking on. Kabardino-Balkarsky Nature Reserve, Caucasus Region of Russia.

Igor Shpilenok / Photographer Patricio Robles Gil reviewing his work with a West Caucasian tur (Capra caucasica) behind him. Kabardino-Balkarsky Nature Reserve, Caucasus Region of Russia.

Patricio Robles Gil / Male Bare Face Curassow (Crax fasciolata) with chick. Parana, Southern Brazil.

Patricio Robles Gil / Giant River Otter (Pteronura brasiliensis) with eel prey in its mouth. Parana, Southern Brazil.

Patricio Robles Gil / Toco Toucan (Ramphastos toco) perching with open beak. Parana, Southern Brazil.

Patricio Robles Gil / Savanna Hawk (Buteogallus meridionalis) taking flight. Parana, Southern Brazil.

Patricio Robles Gil / White-lipped Peccary (Tayassu albirostris / pecari) adults and piglets drinking at river bank. Parana, Southern Brazil.

Patricio Robles Gil / White-lipped Peccary (Tayassu albirostris / pecari) resting in shade on river bank. Parana, Southern Brazil.

Patricio Robles Gil / White-lipped Peccary (Tayassu albirostris / pecari) resting in shade. Parana, Southern Brazil.

Patricio Robles Gil / White-lipped Peccary (Tayassu albirostris / pecari) resting in shade and digging in river bank. Parana, Southern Brazil.

Patricio Robles Gil / Pale-legged Hornero (Furnarius leucopus) male and female birds building their mud nest on a branch. Parana, Southern Brazil.

Patricio Robles Gil / Rufescent Tiger Heron (Tigrisoma lineatum) swallowing fish. Parana, Southern Brazil.

Patricio Robles Gil / Female Jaguar (Panthera onca) on river bank. Parana, Southern Brazil.

Patricio Robles Gil / Green Iguana (Iguana iguana) on tree. Parana, Southern Brazil.

Patricio Robles Gil / King Vulture (Sarcoramphus papa) standing on sand. Parana, Southern Brazil.

Patricio Robles Gil / Jacare / Yacare Caiman (Caiman crocodilus yacare) feeding on large fish. Parana, Southern Brazil.

Patricio Robles Gil / Muscovy Duck (Cairina moschata) on river bank. Parana, Southern Brazil.

Patricio Robles Gil / Pied Lapwing / Plover (Vanellus cayanus) walking on river sands. Parana, Southern Brazil.

Patricio Robles Gil / Giant River Otter (Pteronura brasiliensis) adult resting on log. Parana, Southern Brazil.

Patricio Robles Gil / Greater Rhea (Rhea americana) entering water to cross the river. Parana, Southern Brazil.

Patricio Robles Gil / Female Jaguar (Panthera onca) with Jacare Caiman prey. Parana, Southern Brazil.

Patricio Robles Gil / Black Howler Monkey (Alouatta caraya) in dry months need to drink from the river, risking predation. Parana, Southern Brazil.

Patricio Robles Gil / Giant River Otter (Pteronura brasiliensis) feeding on an eel while Great Kiskadee (Pitangus sulphuratus) scavenges for scraps. Parana, Southern Brazil.

Patricio Robles Gil / Toco Toucan (Ramphastos toco) preening. Parana, Southern Brazil.

Patricio Robles Gil / Toco Toucan (Ramphastos toco) preening. Parana, Southern Brazil.

Patricio Robles Gil / Toco Toucan (Ramphastos toco) need to drink from the river in the dry season, exposing themselves to predation. Parana, Southern Brazil.

Patricio Robles Gil / Little Cuckoo (Coccyua minuta) perched. Parana, Southern Brazil.

Patricio Robles Gil / Large Yellow Anaconda (Eunectes notaeus) resting. Parana, Southern Brazil.

Patricio Robles Gil / Tourists watching a female Jaguar (Panthera onca) from a boat. Piquiri River, Parana, Southern Brazil.

Patricio Robles Gil / Capivara / Capibara (Hydrochoerus hydrochaeris) family resting on river sand bank. Piquiri River, Parana, Southern Brazil.

Patricio Robles Gil / Hyacinth Macaw (Anodorhynchus hyacinthinus) with open beak. Parana, Southern Brazil.

Patricio Robles Gil / Two Giant River Otters (Pteronura brasiliensis) playing on a log. Parana, Southern Brazil.

Patricio Robles Gil / Portrait of a Giant River Otter (Pteronura brasiliensis). Parana, Southern Brazil.

Patricio Robles Gil / Female Jaguar (Panthera onca) with her prey, a Yacare Caiman. Parana, Southern Brazil.

Patricio Robles Gil / American Darter / Anhinga (Anhinga anhinga) spreading its wings to dry them. Parana, Southern Brazil.

Patricio Robles Gil / Black-capped Donacobius (Donacobius atricapilla). Classification is unclear for this species, but it is thought to be related to the Trogons, Wrens or Thrushes. Parana, Southern Brazil.