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Northern giant petrels (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor, South Georgia

Northern giant petrels (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor, South Georgia

Northern giant petrels (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor, South Georgia

Northern giant petrels (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor, South Georgia

Northern giant petrels (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor, South Georgia

Northern giant petrels (Macronectes halli) fighting over the scavenging rights to a dead fur seal pup at St. Andrews Bay, South Georgia

Northern giant petrels (Macronectes halli) fighting over the scavenging rights to a dead fur seal pup at St. Andrews Bay, South Georgia

Pregnant female southern elephant seal (Mirounga leonina) giving birth on the beach in Stromness Bay, South Georgia Island

Female Costa's hummingbird (Calypte costae), in Bahia Concepcion, Baja California Sur, Sea of Cortez, Mexico, North America

Atlantic Puffin (Fratercula arctica), on Skomer Island in July, a nature reserve off the coast of Pembrokeshire, Wales, United Kingdom, Europe

A pair of adult bull Antarctic fur seals (Arctocephalus gazella), fighting in Right Whale Bay, South Georgia, South Atlantic, Polar Regions

Adult bull southern elephant seal (Mirounga leonina), skull on display at the Natural History Museum in Stanley, Falklands, South America

Wild Galapagos giant tortoise (Geochelone elephantopus) at Urbina Bay, Isabela Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

King Penguin chick (Aptenodytes patagonicus) reflected in water, Right Whale Bay, South Georgia Island, Antarctic, Polar Regions

Humpback whale (Megaptera novaeangliae), surfacing off San Jose del Cabo, Baja California Sur, Mexico, North America

Nesting storks on the the Iglesia de San Martin, on the left and centre, and Torre del Alfiler, on the right, Trujillo, Caceres, Extremadura, Spain, Europe

An adult great egret (Ardea alba) on left, and snowy egret (Egretta thula) on right, Rio El Dorado, Amazon Basin, Peru, South America

King Penguins (Aptenodytes patagonicus) on the plain of Right Whale Bay, South Georgia Island, Antarctic, Polar Regions

King Penguin colony (Aptenodytes patagonicus), Right Whale Bay, South Georgia Island, Antarctic, Polar Regions

King Penguins (Aptenodytes patagonicus), Right Whale Bay, South Georgia Island, Antarctic, Polar Regions

King Penguin (Aptenodytes patagonicus) colony in front of snow covered mountains, Right Whale Bay, South Georgia Island, Antarctic, Polar Regions

King Penguins (Aptenodytes patagonicus) crossing a stream, Right Whale Bay, South Georgia Island, Antarctic, Polar Regions

King penguins (aptenodytes patagonicus) right whale bay, south georgia, large group huddled together in snowy terrain

King penguins (aptenodytes patagonicus) right whale bay, south georgia, group huddled together in snow storm

King penguins (aptenodytes patagonicus) right whale bay, south georgia, large group in snowy landscape

King penguins (aptenodytes patagonicus) right whale bay, south georgia, lying down on rocky ground, close-up

King penguins (aptenodytes patagonicus) right whale bay, south georgia, group huddled together in blizzard

King penguins (aptenodytes patagonicus) right whale bay, south georgia, group huddled together in snowy landscape

King penguins (aptenodytes patagonicus) right whale bay, south georgia, group huddled together in snowy terrain

King penguin (aptenodytes patagonicus) right whale bay, south georgia, resting on rocky ground, close-up

King penguins (aptenodytes patagonicus) right whale bay, south georgia, large group in snowy landscape

Young California sea lion (Zalophus californianus) which has become entangled in a gill net on Los Islotes, Gulf of California (Sea of Cortez), Baja California Sur, Mexico

Northern giant petrel (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at St. Andrews Bay on South Georgia Island, Southern Ocean

Adult female California sea lion (Zalophus californianus) which has become entangled in a gill net on Los Islotes, Gulf of California (Sea of Cortez), Baja California Sur, Mexico

Common Bottlenose Dolphin, Tursiops truncatus, breaching right in front of the photographer. Note the scar above the right pectoral flipper which has been caused by the Remora. Costa Rica, Pacific Ocean.

Sperm whale (physeter macrocephalus) A sperm whale dives alongside its companion who has an odd scar at the fron right side of its head.. The Gulf of California.

'Hunters Deer and Elk head drop' sign and barrel, Wyoming, USA. The Wyoming Game and Fish Department collect samples from deer and elk during the hunting season to test for Chronic Wasting Disease (CWD) in the state's deer and elk herds. Chronic wasting disease is a fatal neurological disease that has been diagnosed in free ranging deer, elk and moose in 11 states and two Canadian provinces.

Crown-of-Thorns seastar (Acanthaster planci) Adult animal working its way across sand towards a coral reef. Yap, Federated States of Micronesia, Pacific Ocean. More info: This species feeds on coral as an adult and, in the right circumstances, be devestating to large reef areas.

Northern giant petrel (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor on South Georgia Island, Southern Ocean

Adult female California sea lion (Zalophus californianus) which has become entangled in a gill net on Los Islotes, Gulf of California (Sea of Cortez), Baja California Sur, Mexico

Blue whale (balaenoptera musculus) A delighted photographer with a blue whale tail streaming water right in front of him. Gulf of California.

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

Northern giant petrel (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor on South Georgia Island, Southern Ocean

Young California sea lion (Zalophus californianus) which has become entangled in a gill net on Los Islotes, Gulf of California (Sea of Cortez), Baja California Sur, Mexico

Juvenile brown pelican (left) and adult (right) (Pelecanus occidentalis) in the Gulf of California (Sea of Cortez), Baja California Norte, Mexico.

Northern giant petrel (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor on South Georgia Island, Southern Ocean

Adult brown bears (Ursus arctos) disputing fishing rights for salmon at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean

Northern giant petrel (Macronectes halli) fighting over the scavenging rights to a dead elephant seal pup at Royal Harbor on South Georgia Island, Southern Ocean

(left side) Blackspotted sweetlips (Plectorhinchus Gaterinus), (right side) Masked Butterflyfish (Chaetodon Semilarvatus) Under water , diving, Hurghada, Red Sea, Egypt, Africa.

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

Central American Spinner Dolphin, Stenella longirostris centroamericana, spinning right in front of the photographer, Costa Rica, Pacific Ocean.

Adult bull California sea lion (left) and female (right) (Zalophus californianus) at Los Islotes (the islets), Baja California Sur in the Gulf of California (Sea of Cortez), Mexico.

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

The charro rides alongside the left side of the bull, wraps its tail around his right leg, and tries to bring the bull down in a roll as he rides past it

the charro rides alongside the left side of the bull, wraps its tail around his right leg, and tries to bring the bull down in a roll as he rides past it

A red fox stares right at the camera while a ray of light illuminates one of his amber colored eyes, Yukon Territory

Anatomy of a sow. From left to right: the heart, the digestive system with liver, pancreas, spleen and stomach. Underneath the ureters and from left to right : ovaries, oviducts, uterus and vagina. Above, the terminal part of the digestive tube (colon) with the rectum.

Anatomy of the cow digestive apparatus. From left to right: mouth and esophagus, the reticulum (brown excrescence on the left), the rumen or composed paunch, from the top to the bottom by the dorsal sac, the cranial sac and the ventral sac. The grey excrescence beneath is the abomasum or velles.

Mackenzie Valley Wolves, Canadian Timber Wolves (Canis lupus occidentalis) in the snow, fight for rank order, alpha female, right, reprimanding a young wolf, in front of the pack

Mackenzie Valley Wolves, Canadian Timber Wolves (Canis lupus occidentalis) in the snow, fight for rank order, alpha female, right, reprimanding a young wolf, in front of the pack

African elephant bull walking towards safari vehicle on a gravel road. Etosha National Park, Namibia, Africa

Schuhplattler traditional dance, contest for the Bavarian lion, hosted by the folklore society "d`Veiglberger", Neufahrn on the right of the Isar, Bavaria, Germany, Europe

Southern Right Whale (Eubalaena australis), Valdez Peninsula, Chubut Province, Argentina, South America

White rhinoceros (Ceratotherium simum), mother with young, Solio Ranch Wildlife Sanctuary, Kenya, Africa

Volunteers at dawn at the Laguna de Fuente de Piedra, waiting for the start of the immature Greater Flamingo (Phoenicopterus roseus) capture event in order to ring them, Malaga province, Andalusia, Spain, Europe

Two (hikers) looking at Eibsee lake at sunrise, sun shining over Bavarian alpine foothills, right Zugspitze, Wetterstein mountains near Grainau, Upper Bavaria, Bavaria, Germany, Europe

Lion (Panthera leo), adult, female, group, alert, running, Tswalu Game Reserve, Kalahari, Northern Cape, South Africa, Africa

Little owl (Athene noctua), young bird looking out of the entrance of the nest box, Muensterland, North Rhine-Westphalia, Germany, Europe