Andres M. Dominguez / Eurasian kingfisher (Alcedo atthis) male, perched on branch over pond with tadpole prey in beak, backlit at dawn, Sierra de Grazalema Natural Park, Cadiz, Spain. October.

Andres M. Dominguez / Eurasian kingfisher (Alcedo atthis) male, perched on a rock in pool, backlit at dawn, Sierra de Grazalema Natural Park, Cadiz, Spain. October.

Doug Gimesy / Little pied cormorant (Microcarbo melanoleucos) standing on intertidal rocks, feeding on fish prey, Port Philip Bay, Victoria, Australia.

Gabriel Rojo / Geoffroy's cat (Leopardus geoffroyi) walking past seaweed covered rocks on beach, Punta Norte Nature Reserve, Peninsula Valdes, Chubut Province, Patagonia, Argentina.

Gabriel Rojo / Geoffroy's cat (Leopardus geoffroyi) walking along beach with Gulls (Larus sp.) in background, Punta Norte Nature Reserve, Peninsula Valdes, Chubut Province, Patagonia, Argentina.

George Sanker / Coyote (Canis latrans) hunting in a wetland meadow in summer, Yellowstone National Park, Wyoming, USA. June.

Jussi Murtosaari / Fieldfare (Turdus pilaris) perched in Rowan (Sorbus sp.) tree, feeding on berries, Finland. October.

Jussi Murtosaari / Grey wolf (Canis lupus) shaking fur dry after swimming, Finland. August.

Jussi Murtosaari / Bank vole (Clethrionomys glareolus) standing on hind legs, feeding on Strawberry (Fragaria sp.) leaves, Finland. July.

Jussi Murtosaari / Lesser purple emperor butterfly (Apatura ilia) male, in flight, Finland. July.

Jussi Murtosaari / Peacock butterfly (Aglais io) in flight over wildflowers, Finland. May.

Mark Carwardine / Brown bear (Ursus arctos) female, standing at edge of river, Great Bear Rainforest, British Columbia, Canada. October.

Marie Read / Varied thrush (Ixoreus naevius) male, perched on branch, singing in spring, Eagle River, Alaska, USA. May.

Marie Read / Pacific loons (Gavia pacifica) pair in breeding plumage, on water, Anchorage, Alaska, USA. May.

Marie Read / Northern parula (Parula americana) male in breeding plumage, perched in flowering Eastern redbud (Cercis canadensis) in spring, Ohio, USA. April.

Oliver Hellowell / Red squirrel (Sciurus vulgaris) sitting upright among heather, in woodland garden, Perthshire, Scotland, UK. September. Cropped.

Pal Hermansen / Musk ox (Ovibos moschatus) pair mating, Dovrefjell-Sunndalsfjella National Park, Norway. September.

Roger Powell / Red-throated diver (Gavia stellata) male, running over the water at speed and taking flight, Kongsfjordfjellet, Finnmark, Norway. June.

Roger Powell / Two Ruffs (Calidris pugnax) male, fighting at the lek, Pokka, Finland, Lapland. May.

Roger Powell / Four Greylag geese (Anser anser) flying low over lake, East Chevington Reserve, Druridge Bay, Northumberland, UK. November.

Sven Zacek / Common blue damselflies (Enallagma cyathigerum) pair, in flight over bog pool, Nigula Nature Protection Area, Parnumaa county, Estonia.

Sven Zacek / Capercaillie (Tetrao urogallus) male, with some tail feathers missing, lekking at sunset, Tartumaa county, Estonia.

Sven Zacek / Capercaillie (tetrao urogallus) male, lekking perched on top of a Pine tree at dusk, Tartumaa county, Estonia.

Tui De Roy / Green turtle (Chelonia mydas) swimming with school of Barracuda (Sphyraena sp.) behind, Cousins Rock, near Santiago Island, Galapagos Islands. Endangered.

Staffan Widstrand / RF - Two Ruffs (Philomachus pugnax) male, fighting at lek site, Varanger Peninsula, Finnmark, Norway. June. (This image may be licensed either as rights managed or royalty free.)

Staffan Widstrand / RF - Atlantic guillemot (Uria aalge) standing on rock spreading its wings at sunset, with colony behind, Hornoya bird cliff Island, Vardoe, Varanger Peninsula, Finnmark, Norway. June. (This image may...

Guy Edwardes / Silver-studded blue (Plebejus argus), backlit at sunset, Rhodope Mountains, Bulgaria, June

Joel Sartore / Photo Ark / Blunt-nosed leopard lizard (Gambelia sila) looking around. The animal leaves the frame. Fresno Chaffee Zoo, California. Captive.

Joel Sartore / Photo Ark / Eastern quoll (Dasyurus viverrinus) lying down and looking at the camera, Zoo Leipzig. Captive. Endangered.

Joel Sartore / Photo Ark / Marbled cat (Pardofelis marmorata longicaudata) looking towards the camera and lying down. The animal hisses and bares its teeth. Al Bustan Zoological Centre, Sharjah. Captive.

Joel Sartore / Photo Ark / San Bernardino kangaroo rat (Dipodymys merriami parvus) looking at the camera, then the animal partially leaves frame, San Diego Zoo Safari Park, Escondido, California. Captive. Federally endangered.

Joel Sartore / Photo Ark / Bigclaw crayfish (Faxonius placidus) female oxygenating eggs by fanning them, upper Duck River, Coffee County, Tennessee, USA. Controlled conditions.

Joel Sartore / Photo Ark / Great hornbill (Buceros bicornis) looking around, Al Bustan Zoological Centre, Sharjah. Captive.

Joel Sartore / Photo Ark / Blyth's tragopan (Tragopan blythii) male looking around, San Diego Zoo. Captive.

Joel Sartore / Photo Ark / Red bird-of-paradise (Paradisaea rubra) male looking around and vocalising, Walsrode Bird Park. Captive.

Joel Sartore / Photo Ark / Indochinese green magpie (Cissa hypoleuca) female looking around, Los Angeles Zoo & Botanical Gardens. Captive.

Joel Sartore / Photo Ark / Shaheen peregrine falcon (Falco peregrinus peregrinator) looking around and vocalising, private collection, Dubai. Captive.

Joel Sartore / Photo Ark / Siberian crane (Leucogeranus leucogeranus) female looking around, then the animal lowers its head and ruffles its feathers. International Crane Foundation, Baraboo, Wisconsin. Controlled condiitons. C...

Joel Sartore / Photo Ark / Mountain yellow-legged frog (Rana muscosa) looking at the camera, then the animal jumps out of the frame. Oakland Zoo, California. Captive. Endangered.

Staffan Widstrand / RF - Ruff (Philomachus pugnax) male, displaying at lek site, Varanger Peninsula, Finnmark, Norway. June. (This image may be licensed either as rights managed or royalty free.)

Paul Harcourt Davies / Elephant hawkmoth (Deilephila elpenor) recently emerged, resting on a leaf, Vieste, Gargano, Puglia, Italy. April.

Paul Harcourt Davies / Southern festoon butterfly (Zerynthia polyxena cassandra) freshly emerged resting on leaf and drying its wings, Podere Montecucco, Gargano, Puglia, Italy. April.

Paul Harcourt Davies / Mullein moth (Cucullia verbasci) caterpillar, crawling on plant stem, nr Lago di Varano, Gargano, Puglia, Italy. April.

Paul Harcourt Davies / Common blue butterflies (Polyommatus icarus) pair mating on flower, male on the right, Umbria, Italy. May.

Staffan Widstrand / Brambling (Fringilla montifringilla) perched on branch, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Oystercatcher (Haematopus ostralegus) walking over pebbles on the shore, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Whimbrel (Numenius phaeopus) portrait, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Long-tailed skua (Stercorarius longicaudus) standing on wet ground, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / European golden plover (Pluvialis apricaria) calling, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Willow ptarmigan grouse (Lagopus lagopus) standing on a rock, Varanger Peninsula, Finnmark, Norway. November.

Staffan Widstrand / Red-necked phalarope (Phalaropus lobatus) on water, Varanger Peninsula, Finnmark, Norway.

Staffan Widstrand / Whimbrel (Numenius phaeopus) standing on stony ground, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Atlantic puffin (Fratercula arctica) head portrait, Hornoya bird cliff island, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Arctic skua (Stercorarius parasiticus) in flight, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Kittiwake (Rissa tridactyla) portrait, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Whimbrel (Numenius phaeopus) portrait, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Hoary redpoll (Acanthis hornemanni) perched on dead tree trunk, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Bar-tailed godwit (Limosa lapponica) portrait, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Red-necked phalarope (Phalaropus lobatus) on water, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Three Ruff (Philomachus pugnax) males displaying on lek, with two females walking by, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Atlantic guillemot (Uria aalge) calling and flapping wings at sunset with colony in background, Hornoya bird cliff island, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Two Ruff (Philomachus pugnax) males, displaying at lek site, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Arctic skua (Stercorarius parasiticus) portrait, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / Shag (Phalacrocorax aristotelis) head portrait, Hornoya bird cliff island, Varanger Peninsula, Finnmark, Norway. June.

Staffan Widstrand / RF - Whimbrel (Numenius phaeopus) portrait, Varanger Peninsula, Finnmark, Norway. June. (This image may be licensed either as rights managed or royalty free.)

Staffan Widstrand / RF - European golden plover (Pluvialis apricaria) portrait, Varanger Peninsula, Finnmark, Norway. June. (This image may be licensed either as rights managed or royalty free.)

Staffan Widstrand / RF - Red-necked phalarope (Phalaropus lobatus) on water, calling, Varanger Peninsula, Finnmark, Norway. June. (This image may be licensed either as rights managed or royalty free.)

Paul Harcourt Davies / Plain tiger butterfly (Danaus chrysippus) resting on grass stem at dawn, near Lago di Lesina, Gargano, Puglia, Italy. September.

Paul Harcourt Davies / Plain tiger butterfly (Danaus chrysippus) resting on seedhead at dusk, Lago di Lesina, Gargano, Puglia, Italy. September.

Paul Harcourt Davies / Robber fly (Engelepogon brunnipes) resting on leaf with insect prey, Podere Montecucco, Orvieto, Umbria, Italy. August.

Paul Harcourt Davies / European dwarf mantis (Ameles spallanzania) resting on dried plant stem, nr Allerona, Umbria, Italy. July.

Paul Harcourt Davies / Black-veined white butterfly (Aporia crataegi) nectaring on Hairy vetch (Vicia villosa) flower, Campo Imperatore, Gran Sasso, Abruzzo, Italy. May.

Paul Harcourt Davies / Forester moths (Adscita statices) pair mating, Sibillini, Umbria, Italy. May.

Nigel Cattlin / Parasitoid wasp (Diglyphus isaea) female, ovipositing in a Leafminer larva, adult wasps used for biological pest control, England, UK.

Nigel Cattlin / Parasitoid wasp (Diglyphus isaea) female, ovipositing in a Leafminer larva, adult wasps used for biological pest control, England, UK.

Nigel Cattlin / Parasitoid wasp (Praon myzophagum) female, with ovipositor extended, laying eggs in Aphid (Aphidoidea) pest. Biological control in protected crops, England, UK.

Nigel Cattlin / Parasitoid wasp (Praon myzophagum) on leaf next to Aphid (Aphidoidea) host, wasp parasite used in biological control in protected crops, England, UK.

Nigel Cattlin / Parasitoid wasp (Aphidius ervi) female, laying eggs with extended ovipositor in aphid host pest, England, UK.

Nigel Cattlin / Encyrtid wasp (Leptomastix dactylopii) adult parasitoid wasp, a parasite of Mealybug pests, used in biological control for protected crops, England, UK.

Nigel Cattlin / Parasitic wasp (Dacnusa sibirica) female ovipositing in a Leafminer larva in a leaf gallery, England, UK.

Nigel Cattlin / Parasitoid wasp (Cotesia glomerata) pupa cocoons from larvae emerging from a parasitised White butterfly caterpillar (Pieris sp.), England, UK.

Nigel Cattlin / Parasitoid wasp (Praon spp.) cocoon under parasitised Aphid (Aphidoidea), parasite used for biological pest control in protected crops.

Phil Savoie / Buff-tailed bumblebee (Bombus terrestris) nectaring on Cucumber (Cucumis sativus) flower, Monmouthshire, Wales, UK.

Phil Savoie / Red-tailed bumblebee (Bombus lapidarius) nectaring on flower (Allium sp.), Monmouthshire, Wales UK. July.

Phil Savoie / Red-tailed bumblebee (Bombus lapidarius) nectaring on flower (Allium sp.), Monmouthshire, Wales UK. July. Cropped.

Phil Savoie / Smeathman's furrow bee (Lasioglossum smeathmanellum) in flight, approaching Dwarf narcissus (Narcissus canaliculatus) flowers, Monmouthshire, Wales, UK. March.

Phil Savoie / Buff-tailed bumblebee (Bombus terrestris) nectaring on flower (Dahlia sp.), Monmouthshire, Wales, UK.

Phil Savoie / Buff-tailed bumblebee (Bombus terrestris) nectaring on flower, Monmouthshire, Wales, UK.

Phil Savoie / Bee fly (Bombylius major) in flight, approaching Dwarf narcissus (Narcissus canaliculatus) flowers, Monmouthshire Wales, UK. March. Cropped.

Jack Perks / Mirror carp (Cyprinus carpio) swimming into frame and past the camera. The animal disappears into the murky water. Shropshire, UK.

Jack Perks / Brown trout (Salmo trutta) pair courting. The male quivers near the female and then she uses her tail fin to dig a shallow depression (a redd). Chalk stream, Cambridgeshire, UK. January.

Jack Perks / Common bream (Abramis brama) shoal swimming past, in a shallow river. The fish swim off into the background. Hampshire, UK.

Tony Wu / Elkhorn sculpin (Alcichthys elongatus) male, guarding its brood of bright yellow eggs in a rock crevice, Hokkaido, Japan, Pacific Ocean.

Sven Zacek / Whooper swan (Cygnus cygnus) standing in flooded river meadow during spring flooding, Alam-Pedja Nature Reserve Tartumaa county, Southern Estonia.

Russell Laman / Emperor penguin (Aptenodytes forsteri) leaping from the sea onto ice, Cape Colbeck, Ross Sea, Antarctica.

Lorraine Bennery / Three Malagasy sacred ibis (Threskiornis bernieri) perched in tree in mangroves, Betsiboka river, Majunga area, Madagascar. Endangered.