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The Aurora Borealis, the spectacular Northern Lights turn the sky green and purple above Kvaloya island at Tromso in the Arctic Circle in Northern Norway

Larvae stage of Tent Moth, Eastern Tent Caterpillars, make tent of silk on host hedgerow in County Cork, Ireland

Larvae stage of Tent Moth, Eastern Tent Caterpillars, make tent of silk on host hedgerow in County Cork, Ireland

A murmuration of starlings, numbering well over a million birds, flock together to roost at dusk on the Avalon Marshes at Shapwick Heath Nature Reserve in Somerset

Larvae stage of Tent Moth, Eastern Tent Caterpillars, make tent of silk on host hedgerow in County Cork, Ireland

A murmuration of starlings, numbering well over a million birds, form the shape of an atomic bomb mushroom cloud as they come in to roost at dusk on the Avalon Marshes at Shapwick Heath Nature Reserve in Somerset

Aurora Borealis spectacular Northern Lights green and purple curtain effect and Venus star at Grotfjord, Kvaloya island, Tromso, Arctic Circle, Northern Norway

Larvae stage of Tent Moth, Eastern Tent Caterpillars, make tent of silk on host hedgerow in County Cork, Ireland

Starlings, a murmuration of a million birds, in mushroom cloud shape as they drop to roost on Avalon Marshes, UK

The Aurora Borealis, the spectacular Northern Lights fill the sky with dazzling green light above Kvaloya island at Tromso in the Arctic Circle in Northern Norway

Starlings, a murmuration of a million birds, in mushroom cloud shape as they drop to roost on Avalon Marshes, UK

Larvae stage of Tent Moth, Eastern Tent Caterpillars, make tent of silk on host hedgerow in County Cork, Ireland

Larvae stage of Tent Moth, Eastern Tent Caterpillars, make tent of silk on host hedgerow in County Cork, Ireland

A murmuration of starlings, numbering well over a million birds, gather as a flock to roost at dusk on the Avalon Marshes at Shapwick Heath Nature Reserve in Somerset

Aurora Borealis spectacular Northern Lights green and purple curtain effect and Venus star at Grotfjord, Kvaloya island, Tromso, Arctic Circle, Northern Norway

The Aurora Borealis, the spectacular Northern Lights fill the sky with dazzling green light above Kvaloya island at Tromso in the Arctic Circle in Northern Norway

The Aurora Borealis, the spectacular Northern Lights fill the sky with dazzling green light above Kvaloya island at Tromso in the Arctic Circle in Northern Norway

Starlings, a murmuration of a million birds gather to roost on Avalon Marshes at Shapwick Heath Nature Reserve, UK

The Aurora Borealis spectacular Northern Lights and Venus star at Grotfjord, Kvaloya island, Tromso in the Arctic Circle, Northern Norway

Aurora Borealis spectacular Northern Lights green and purple curtain effect and Venus star at Grotfjord, Kvaloya island, Tromso, Arctic Circle, Northern Norway

A general view of the Athabasca Glacier, a six kilometre tongue of ice flowing from the Columbia Icefield. It is the best-known glacier in the Canadian Rockies and is situated in Jasper National Park, Alberta, Canada.

Eruptions from vents in the crater of Mount Yasur, Yasur Volcano, Tanna Island, Vanuatu, PacificEruptions from vents in the crater of Mount Yasur in east Tanna, one of the Pacific's most accessible & active volcanoes

Eruption from vent in the crater of Mount Yasur, Yasur Volcano, Tanna Island, Vanuatu, PacificEruption from vent in the crater of Mount Yasur in east Tanna, one of the Pacific's most accessible & active volcanoes

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.

Traditional wooden herdsmen's huts with pine shingle roofs and Cattle (Bos taurus) standing near pond on 1600m high pastureland at Velika Planina plateau, Kamnik-Savinja Alps, Slovenia.

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.

Scots pine sapling (Pinus sylvestris) struggling to survive, growing from fissure in bare granite shoreline of Lake Saimaa, near Savonlinna, Finland.

Photovoltaic solar tracker at a solar farm near Antissa, Lesbos (Lesvos), Greece. MORE INFO: Solar trackers automatically rotate and tilt photovoltaic panels to follow the sun throught the day, maximising sunlight absorpton rates. Several of these Solar farms have been built on Lesbos since 2010.

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.

Thrift (Armeria maritima), Rock sea lavender (Limonium binervosum) and Coastal ragwort (Senecio leucanthemifolius) flowering on karst limestone sea cliffs at Pria, near Ribadesella, Asturias, Spain.

Aftermath of a major forest fire within Corsica's National Park (Parc Naturel Regional de Corse), a year on, with large area of forest and maquis scrub destroyed and first flush of regrowth by grasses and flowers, near Aullene, Corsica, France.

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.

Frozen, snow dusted pastureland, arable fields and row of trees in winter, Frozen Hill, near Bath, UK.

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

Solar farm with four Photovoltaic solar trackers, near Antissa, Lesbos (Lesvos), Greece. MORE INFO: Solar trackers automatically rotate and tilt photovoltaic panels to follow the sun throught the day, maximising sunlight absorpton rates. Several of these Solar farms have been built on Lesbos since 2010.

Natural rock archway carved by the sea through karst limestone rock at Cuevas del mar (sea caves) beach, near Llanes, Asturias, Spain.

Granite rocks smoothed and sculpted by wind, weather and the sea into strange organic shapes, Campomoro Point, near Propriano, Corsica, France.

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.

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

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

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

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

Aerial views of snow-capped mountains, ice fields, and glaciers on a commercial flight from Juneau to Anchorage Alaska, USA, Pacific Ocean

Aerial views of snow-capped mountains, ice fields, and glaciers on a commercial flight from Juneau to Anchorage Alaska, USA, Pacific Ocean

A HUGE calving event from the South Sawyer Glacier in Tracy Arm Wilderness Area in Southeast Alaska, USA

Lindblad Expeditions guests doing the "polar Plunge" in Port Foster near Whalers Bay inside the caldera on Deception Island, South Shetland Island Group, Antarctica. NO MODEL RELEASES FOR THIS IMAGE.

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

Scenic view of Leon Dormido (Sleeping Lion) Island off San Cristobal Island in the Galapagos Island Archipelago, Ecuador

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

Greater flamingo (Phoenicopterus ruber) foraging for small pink shrimp (Artemia salina) in saltwater lagoon in the Galapagos Island Archipelago, Ecuador

Spotted eagle ray (Aetobatus narinari) underwater at Leon Dormido (Sleeping Lion) Island off San Cristobal Island in the Galapagos Island Archipelago, Ecuador

Great frigatebird (Fregata minor) taking handouts from a fisherman in Puerto Ayora on Santa Cruz Island, in the Galapagos Island Archipelago, Ecuador

Spawning pink salmon (Oncorhynchus gorbuscha) leaping fromn the water in a stream running out of Lake Eva, Southeast Alaska, USA

Adult brown bear (Ursus arctos) scratching its back on a tree at the Brooks River in Katmai National Park near Bristol Bay, Alaska, USA. Pacific Ocean