Paul Williams / Kinabalu Giant red leech (Mimobdella buettikoferi) feeding on Kinabalu Giant earthworm (Pheretima darnleiensis), Mount Kinabalu, Borneo.

Marie Read / Abstract patterns of reflected sky and clouds on the ocean with a silhouetted Red-faced cormorant (Phalarocorax urile) in flight, St. Paul Island, Pribilof Islands, Alaska, USA, July.

Marie Read / Horned Puffin (Fratercula corniculata) flying over a pattern of kelp and sea foam, photographed from above, St. Paul, Pribilof Islands, Alaska, USA. July.

Paul Hobson / Rufous motmot (Baryphthengus martii) perched on branch. Rancho Naturalista, Cartago, Costa Rica.

Paul Hobson / Red squirrel (Sciurus vulgaris) jumping towards camera. Scotland, UK. February.

Paul Hobson / Red deer (Cervus elaphus) herd during rut in morning light. Derbyshire, England, UK. October.

Paul Hobson / Red deer (Cervus elaphus) stags in snowy Pine forest. Scotland, UK. March.

Paul Hobson / Resplendent quetzal (Pharomachrus mocinno) male perched on branch. Costa Rica.

Paul Hobson / Parrot snake (Leptophis ahaetulla) in aggressive pose with mouth open. Costa Rica.

Paul Hobson / Marsh fritillary (Euphydryas aurinia), group feeding on Marsh thistle (Cirsium palustre). Lincolnshire, England, UK.

Paul Hobson / Rivoli's hummingbird (Eugenes fulgens) nectaring on Fuchsia (Fuchsia sp) flower. Costa Rica.

Paul Hobson / Leaf-nosed bat (Phyllostomidae sp), three nectaring on flower. Costa Rica.

Paul Hobson / Leaf-nosed bat (Phyllostomidae sp) flying towards Banana (Musa sp) flower to feed. Costa Rica.

Paul Hobson / Keel-billed toucan (Ramphastos sulfuratus) perched on branch with beak open. Laguna del Lagarto, Alajuela, Costa Rica.

Paul Hobson / Green-crowned brilliant (Heliodoxa jacula), three feeding on Lobster-claw (Heliconia sp) flower in rain. Costa Rica.

Paul Hobson / Red fox (Vulpes vulpes), two cubs play fighting. Sheffield, England, UK. May.

Paul Hobson / Red fox (Vulpes vulpes) cub looking at camera, in morning. Sheffield, England, UK. June.

Paul Hobson / Badger (Meles meles) eating apples in urban garden. Sheffield, England, UK. October.

Paul Hobson / Badger (Meles meles) crossing road in residential area at night. Sheffield, England, UK. October 2018.

Paul Hobson / Badger (Meles meles) amongst Bluebells (Hyacinthoides non-scripta). Scotland, UK. May.

Paul Hobson / Badger (Meles meles) emerging through gateway in wall at night. In urban area, Sheffield, England, UK. October 2018.

Paul Hobson / Wood warbler (Phylloscopus sibilatrix) singing whilst perched on branch, silhouetted at dawn. Sheffield, England, UK. May.

Paul Hobson / Violet sabrewing hummingbird (Campylopterus hemileucurus) nectaring on Orchid. Costa Rica.

Paul Hobson / Turtle dove (Streptopelia turtur) standing at a drinking pool. Hungary. May.

Paul Hobson / Spoonbill (Platalea leucorodia) preening, close up. Hungary. May.

MYN / Paul Marcellini / Sequence of an American alligator (Alligator mississippiensis) hatching from its egg, Palmdale, Florida, USA. Digital composite.

Paul Williams / Moose (Alces alces) female with twin calves, Baxter State Park, Maine, USA, June.

Paul Williams / Sumatran tiger (Panthera tigris sumatrae) close up portrait, captive.

Paul Williams / Lion (Panthera leo) close up of teeth while its snarling, captive.

Paul Williams / RF - Sumatran tiger (Panthera tigris sumatrae) close up portrait, captive. staring at camera, licking nose, captive. (This image may be licensed either as rights managed or royalty free.)

Paul Williams / RF - Lion (Panthera leo) portrait, looking proud, Captive (This image may be licensed either as rights managed or royalty free.)

Gavin Hellier / Timelapse from day to night looking towards the Peter and Paul Fortress, St, Petersburg, Russia, May 2016. Hellier

Paul Williams / Lightning storm, Western Australia. December 2013. Image stacking / composite composed of three consecutive images.

Paul Williams / Budgerigars (Melopsittacus undulatus) flocking to find water, Northern Territory, Australia

Paul D Stewart / Photographic reconstruction of Archaeopteryx by Paul D. Stewart. The fossils of this species was from 150 million years ago, and is thought of as a stage between feathered dinosaurs and modern birds.

Gerrit Vyn / Tufted puffin (Fratercula cirrhata) in breeding plumage. St. Paul Island, Alaska. July.

Paul Hobson / Weasel (Mustela nivalis) looking out of hole on woodland floor with snowdrops, Sheffield, England, UK.

Paul Hobson / Bobcat (Lynx rufus) walking in snow, Yellowstone National Park, Wyoming, USA, February.

Paul Hobson / Glowworm (Lampyris noctiluca) at night, Cambridgeshire, England, UK, August.

Paul Hobson / Weasel (Mustela nivalis) head and neck looking out of yellow autumn acer leaves, Sheffield, England, UK.

Paul Hobson / Weasel (Mustela nivalis) investigating birch stump with bracket fungus in autumn woodland, Sheffield.

Marie Read / Horned puffin (Fratercula corniculata) close-up portrait, St. Paul Island, Pribilofs, Alaska, USA, July.

Marie Read / Tufted puffin (Fratercula cirrhata), close-up portrait, St. Paul Island, Pribilofs, Alaska, USA, July.

Marie Read / Horned puffins (Fratercula corniculata), one landing with outspread wings, to join its mate on cliff ledge, St. Paul Island, Pribilofs, Alaska, USA, July.

MYN / Paul van Hoof / Great green bush-cricket (Tettigonia viridissima) female, The Netherlands, July. Meetyourneighbours.net project

MYN / Paul van Hoof / Common spadefoot toad (Pelobates fuscus) composite showing metamorphosis from larva to adult, The Netherlands, meetyourneighbours.net project

Paul Williams / Spectral tarsier (Tarsius tarsier) returning to sleep in fig tree after a night hunting, Tangkoko, Sulawesi, Indonesia.

Paul Williams / Javan slow loris (Nycticebus javanicus) rescued by Jakarta Animal Aid Network (JAAN), in holding cage, Animal rescue centre, Jakarta, Indonesia. Critically Endangered. Post production to remove light...