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Adult black-browed albatross (Thalassarche melanophris) feeding chick in the New Island Nature Reserve, Falkland Islands, South America

Gentoo penguin (Pygoscelis papua) feeding its chick, Volunteer Point, Falkland Islands, South America

Western Meadowlark (Sturnella neglecta), Antelope Island State Park, Utah, United States of America, North America

Hippopotamus (Hippopotamus amphibius) yawning, Serengeti National Park, Tanzania, East Africa, Africa

Hippopotamus (Hippopotamus amphibius) showing aggression, Serengeti National Park, Tanzania, East Africa, Africa

Bull moose (Alces alces), in the snow with open mouth, Grand Teton National Park, Wyoming, United States of America, North America

California sea lions (Zalophus californianus) hauled out on Los Islotes, Baja California Sur, Mexico, North America

Lion (Panthera leo) yawning, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Lioness (Panthera leo), Ngorongoro crater, Ngorongoro Conservation Area, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Hippopotamus (Hippopotamus amphibius) yawning, Serengeti National Park, Tanzania, East Africa, Africa

Young male lion (Panthera leo), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Male and female Antarctic fur seal (Arctocephalus gazella), showing extreme sexual dimorphism, King Edward Point, South Georgia, Polar Regions

Magellanic penguin (Spheniscus magellanicus) calling, giving a warning call, Patagonia, Chile, South America

Southern elephant seal (Mirounga leonina) adult female calling, Prion Island, South Georgia, UK Overseas Protectorate, Polar Regions

Palechanting goshawk (Melierax canorus), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Red-winged blackbird (Agelaius phoeniceus) male, San Jacinto Wildlife Area, California, United States of America, North America

Portrait of a lioness (Panthera leo) in the bush on a kopje known as Lion Rock in Lualenyi reserve, Tsavo, Kenya, East Africa, Africa

Antarctica fur seal pup (Arctocephalus gazella), above and below underwater in Husvik Bay, South Georgia, Polar Regions

Two hippopotamus (Hippopotamus amphibius) fighting, Masai Mara Game Reserve, Kenya, East Africa, Africa

A curious young Antarctic fur seal (Arctocephalus gazella), Gold Harbour, South Georgia, Polar Regions

Lioness (Panthera leo) in the Kalahari, Kgalagadi Transfrontier Park, Northern Cape, South Africa, Africa

Great egret (Ardea alba) flipping prey in its beak, San Jacinto Wildlife Area, California, United States of America, North America

Snorkeller and whale shark (Rhincodon typus) feeding at the surface on zooplankton, mouth open, known as ram feeding, Yum Balam Marine Reserve, Quintana Roo, Mexico, North America

Bluetit bird feeding hungry young nestling in a garden bird box, The Cotswolds, Oxfordshire, England, United Kingdom

Tourists watch female Bengal tiger, Panthera tigris tigris, in Ranthambore National Park, Rajasthan, India

Bluetit hungry young nestling bird cheeping in a garden bird box, The Cotswolds, Oxfordshire, England, United Kingdom

Bluetit bird feeding hungry young nestling in a garden bird box, The Cotswolds, Oxfordshire, England, United Kingdom

Bluetit hungry young nestling bird awaits feeding in a garden bird box, The Cotswolds, Oxfordshire, England, United Kingdom

Two scuba divers, giant moray (Gymnothorax javanicus) with open mouth, and coral reef, Ras Mohammed National Park, Red Sea, Egypt, North Africa, Africa

White-fronted tern (Sterna Striata) calling on a rock near South Head on the Tasman Sea, North Island, New Zealand

Southern Elephant Seal bulls (Mirounga leonina) fighting, Hannah Point, South Shetland Islands, Antarctica, Polar Regions

Southern Elephant Seal bulls (Mirounga leonina) fighting, Hannah Point, South Shetland Islands, Antarctica, Polar Regions

American alligator with mouth open showing its teeth basking by Turner River by Tamiami Trial, the Florida Everglades, USA

Southern Elephant Seal bulls (Mirounga leonina) fighting, Hannah Point, South Shetland Islands, Antarctica, Polar Regions

Hungry California harbour seal (Zalophus californianus) with mouth wide open, Sea Life Park, Oahu Hawaii, United States of America, Pacific

Young Galapagos sea lion (Zalophus wollebaeki) catching and eventually eating a Sally Lightfoot crab (Grapsus grapsus) in the Galapagos Island Group, Ecuador. Pacific Ocean.

Grey Seal (Halichoerus grypus) close up head shot of bull with mouth open showing aggression and a wave breaking over his head.. Mull of Kintyre near Campbeltown, Argyll, Scotland, UK

Basking shark feeding at surface in tide line with mouth open (Cetorhinus maximus) Hebrides, Scotland (RR)

Young Galapagos sea lion (Zalophus wollebaeki) catching and eventually eating a Sally Lightfoot crab (Grapsus grapsus) in the Galapagos Island Group, Ecuador. Pacific Ocean.