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European Chub (Squalius or Leuciscus cephalus) shoal in the clear water of Plitvice Lakes National Park, Croatia. MORE INFO: Chub traditionally inhabit more lowland waters in Croatia, but they have proliferated since being introduced to Plitvice Lakes, which are warmer than in the past due to climate change, and they have reduced native trout populations considerably by predating their eggs.

Red-breasted goose (Branta ruficollis) group approaching on land, captive, WWT Slimbridge, Gloucestershire, UK.

Little egret (Egretta garzetta) adult stalking fish, reflected in water surface, Danshuei river estuary, Taiwan.

Oriental hornet (Vespa orientalis) using its jaws to detach two suckersfrom Common Octopus tentacle as it hangs in the sun to tenderise. Skala Sikaminia harbour, Lesbos (Lesvos) Greece. MORE INFO: The yellow parts of this hornet's cuticle absorb sunlight and the pigment xanthopterin converts light into electrical energy.

Black alder (Alnus glutinosa) carr swamp forest edge in early spring, Biebrza National Park, Podlaskie, Poland.

Goldenrod crab spider (Misumenia vatia) adult female, white form, camouflaged on Wild Angelica (Angelica sylvestris) flowers sinking fangs into the head of a large Horse fly (Dasyrhamphis anthracinus), Corsica, France. MORE INFO: Crab spider family Thomisidae, Horse fly family Tabanidae, plant family Apiaceae.

European rhinoceros beetle (Oryctes nasicornis) adult male, Corsica, France. MORE INFO: Scarab beetle family Scarabaeidae.

Greater flamingos (Phoenicopterus roseus), three adults land to join many others and roosting Avocets (Recurvirostra avocetta) on Kallini salt pans during the autumn migration period, Isle of Lesbos (Lesvos), Greece.

Formosan or Taiwan macaque (Macaca cyclopis) adult male giving threat yawn while sitting on branch of banyan tree (Ficus microcarpus), Chaishan, Kaohsiung, Taiwan.

Wigeon (Anas penelope) flock in flight over frozen, flooded marshland on a foggy winter morning, with some drakes calling, Greylake RSPB reserve, Somerset Levels, UK.

Parasite fly or Tachinid fly (Cylindromyia bicolor) feeding on Wild angelica (Angelica sylvestris) umbel flowers, Corsica, France. MORE INFO: Parasite fly or Tachinid fly family Tachinidae, plant family Apiaceae.

Whole Common Octopus (Octopus vulgaris) and pairs of tentacles hanging in the sun against blue sky before cooking, Skala Sikaminia harbour, Lesbos (Lesvos), Greece.

Common blue butterfly (Polyommatus icarus) sun basking on grass stem in limestone meadow, Wiltshire, UK. MORE INFO: Butterfly family Lycaenidae.

Guests from the Lindblad Expedition ship National Geographic Explorer kayaking in and around the Antarctic Peninsula in the summer months.

Young southern elephant seals (Mirounga leonina) with excited visitor on the beach at South Georgia in the Southern Ocean

South American Sea Lion (Otaria flavescens) hauled out on small rocky islet just outside Ushuaia, Beagle Channel, Argentina

Adult Imperial Shag (Phalacrocorax (atriceps) from breeding colony on offshore islets in the Beagle Channel, coastal southern Chile and Argentina

A stranded Svalbard reindeer fawn (Rangifer tarandus platyrhynchus) on ice floe at Monaco Glacier in Wood Fjord, Spitsbergen, Svalbard Archipelago, Norway

A stranded Svalbard reindeer fawn (Rangifer tarandus platyrhynchus) on ice floe at Monaco Glacier in Wood Fjord, Spitsbergen, Svalbard Archipelago, Norway

Hawaiian Spinner Dolphin pod (Stenella longirostris) underwater in Honolua Bay off the northwest coast of Maui, Hawaii, USA, Pacific Ocean

Adult Imperial Shag (Phalacrocorax (atriceps) atriceps) from breeding colony on offshore islets in the Beagle Channel, coastal southern Chile and Argentina

Adult male great frigate bird (Fregata minor) with inflated gular on North Seymour Island in the Galapagos Island Group, Ecuador

California Gray Whale (Eschrichtius robustus) in San Ignacio Lagoon on the Pacific side of the Baja Peninsula, Baja California Sur, Mexico

A stranded Svalbard reindeer fawn (Rangifer tarandus platyrhynchus) on ice floe at Monaco Glacier in Wood Fjord, Spitsbergen, Svalbard Archipelago, Norway

Adult Galapagos penguin (Spheniscus mendiculus) split view underwater in the Galapagos Island Group, Ecuador

Galapagos sea lion mother and nursing pup (Zalophus wollebaeki) hauled out on the beach in the Galapagos Island Group, Ecuador. Pacific Ocean.

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

Adult emperor penguin (Aptenodytes forsteri) on sea ice near Snow Hill Island in the Weddell Sea, Antarctica.

Brown Bear (Ursus arctos) fishing for pink salmon near the salmon weir at Pavlof Harbor on Chichagof Island in Southeast Alaska, USA. Pacific Ocean.

Adult leopard seal (Hydrurga leptonyx) hauled out on ice floe near the Antarctic Peninsula, Southern Ocean

Adult female leopard seal (Hydrurga leptonyx) stalking, then killing and eating an adult gentoo penguin in Paradise Bay, Antarctica, Southern Ocean

A small pod of 8 Type B killer whales (Orcinus nanus) in pack ice near Snow Hill Island Island, Weddell Sea, Antarctica, Southern Ocean

Curious adult leopard seal (Hydrurga leptonyx) approaches Zodiac near Booth Island, Antarctica, Southern Ocean

Adult male green sea turtle (Chelonia mydas) in the protected marine sanctuary at Honolua Bay on the northwest side of the island of Maui, Hawaii, USA

Chinstrap penguin (Pygoscelis antarctica) colony at Baily Head on Deception Island, South Shetland Island Group, Antarctica

Long-beaked common dolphin pod (Delphinus capensis) encountered in the southern Gulf of California (Sea of Cortez), Baja California Sur, Mexico

A small group of caribou (Rangifer tarandus) migrating north to feeding grounds in the spring from Yellowknife, Northwest Territories, Canada

A younger polar bear (Ursus maritimus) scavenging a fresh bearded seal kill, Monacobreen Glacier, Spitsbergen, Norway

Polar bears (Ursus maritimus) adult and cub in snow. Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Polar bear (Ursus maritimus) adult on snow, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Polar bears (Ursus maritimus) adult and cub hunting, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Adult Magellan goose or upland goose (Chloephaga picta) with goslings on Carcass Island in the Falkland Islands, South Atlantic Ocean

Crabeater seal (Lobodon carcinophaga) hauled out on ice floe near the Antarctic Peninsula, Antarctica

Male Great frigatebird (Fregata minor) in breeding plumage (note the red gular pouch) on North Seymour Island in the Galapagos Island Archipelago, Ecuador

Greater flamingo (Phoenicopterus ruber) in flight over a saltwater lagoon in the Galapagos Island Archipelago, Ecuador