Morley Read / Leaf frog (Agalychnis hulli) blinking its eyes, Amazon rainforest, Orellana Province, Ecuador.

Morley Read / Leaf frog (Agalychnis hulli) blinking its eyes, Amazon rainforest, Orellana Province, Ecuador.

Morley Read / Slow motion clip of a Leaf cutter ant (Atta) carrying a leaf along a branch, Orellana Province, Ecuador.

Morley Read / Parrot snake (Leptophis ahaetulla) threat display, Amazon rainforest, Orellana Province, Ecuador.

Morley Read / Slow motion clip of Leafcutter ants (Atta) carrying pieces of leaves back to their nest, Amazon rainforest, Napo Province, Ecuador.

Claudio Contreras / Californian sea lion (Zalophus californianus) swimming in Southern sea palm (Eisenia arborea) and Giant Kelp (Macrocystis pyrifera) forest, San Benitos Islands, Baja California Pacific Islands Biosphe...

Sergio Hanquet / Green sea turtle (Chelonia mydas), two viewed from above. Tenerife, Canary Islands.

Danny Green / Polar bear (Ursus maritimus) walking across sea ice, reflected in water. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) female resting with cubs on glacier. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) female and cubs feeding on Whale carcass. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) and two cubs feeding on Whale carcass. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) and cubs, standing on sea ice. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) and cubs resting on sea ice. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) female and cubs, one cub walking up slope of ice in foreground. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) and cubs feeding on Whale carcass. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) and cubs feeding on Whale carcass, on iceberg. Svalbard, Norway, July 2018.

Danny Green / Polar bear (Ursus maritimus) walking across ice, snow covered mountain in background. Svalbard, Norway, April 2018.

Danny Green / Polar bear (Ursus maritimus) resting in snow. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) licking paw, close-up. Svalbard, Norway, April.

Danny Green / Polar bear (Ursus maritimus) standing on glacier. Svalbard, Norway, July 2018.

Danny Green / Polar bear (Ursus maritimus) standing on ice. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) looking for food on ice. Svalbard, Norway, April.

Danny Green / Polar bear (Ursus maritimus) male standing beside rocks in frozen and snow covered landscape. Svalbard, Norway, April 2019.

Danny Green / Polar bear (Ursus maritimus) male walking across frozen landscape. Svalbard, Norway, April 2019.

Danny Green / Polar bear (Ursus maritimus) male in snow. Svalbard, Norway, April.

Danny Green / Polar bear (Ursus maritimus), male and female approaching each other across snow covered rocky landscape. Svalbard, Norway, April 2019.

Danny Green / Polar bear (Ursus maritimus) male approaching female on snow covered hill top. Svalbard, Norway, April 2019.

Danny Green / Polar bear (Ursus maritimus) male approaching female in rocky area covered in snow. Svalbard, Norway, April 2019.

Danny Green / Brunnich's guillemot (Uria lomvia) colony in mist, many birds in flight and nesting on cliffs. Svalbard, Norway, July 2018.

Danny Green / Arctic fox (Vulpes lagopus), two in snow covered landscape. Svalbard, Norway, April 2019.

Danny Green / Arctic fox (Alopex lagopus) standing on ice, in winter pelage. Svalbard, Norway, April.

Danny Green / RF - Polar bear (Ursus maritimus) male walking through snow covered landscape, mountains in background. Svalbard, Norway, April (This image may be licensed either as rights managed or royalty free.)

Danny Green / RF - Arctic fox (Alopex lagopus) in winter pelage, camouflaged in snow. Svalbard, Norway, April (This image may be licensed either as rights managed or royalty free.)

Danny Green / RF - Arctic fox (Alopex lagopus) sitting with summer pelage, tuft of fur on head. Svalbard, Norway, July. (This image may be licensed either as rights managed or royalty free.)

Danny Green / RF - Reindeer (Rangifer tarandus) walking up slope in snow. Svalbard, Norway, April. (This image may be licensed either as rights managed or royalty free.)

Danny Green / RF - Polar bear (Ursus maritimus) cub walking in snow. Svalbard, Norway, April. (This image may be licensed either as rights managed or royalty free.)

Danny Green / RF - Polar bear (Ursus maritimus) female walking across ice. Svalbard, Norway, April. (This image may be licensed either as rights managed or royalty free.)

Danny Green / Arctic fox (Alopex lagopus) standing in tundra. Svalbard, Norway, July.

Danny Green / Ringed seal (Pusa hispida) and pup resting on ice. Svalbard, Norway. April.

Danny Green / Reindeer (Rangifer tarandus), two standing on ridge in blizzard. Svalbard, Norway. April.

Danny Green / Reindeer (Rangifer tarandus), two play fighting in snow. Svalbard, Norway, April.

Danny Green / Reindeer (Rangifer tarandus), two standing on ridge in snow. Svalbard, Norway, April.

Danny Green / Reindeer (Rangifer tarandus) standing on ridge in snow, another reindeer in background. Svalbard, Norway, April.

Danny Green / Reindeer (Rangifer tarandus) hunkering down in snow during blizzard. Svalbard, Norway, April.

Danny Green / Reindeer (Rangifer tarandus) walking in snow. Svalbard, Norway, April.

Danny Green / Polar bear (Ursus maritimus) female and cubs play fighting. Svalbard, Norway, March 2018.

Danny Green / Polar bear (Ursus maritimus) two walking in snowy landscape. Svalbard, Norway, April 2018.

Danny Green / Polar bear (Ursus maritimus) male female pair looking upwards, snow covered hills in background. Svalbard, Norway, April 2018.

Danny Green / Polar bear (Ursus maritimus) group on ice, female and cubs feeding on Whale carcass. Svalbard, Norway, June 2018.

Danny Green / Polar bear (Ursus maritimus) resting on sea ice, view from above. Svalbard, Norway, June 2018.

Danny Green / Polar bear (Ursus maritimus) sleeping in snow. Churchill, Manitoba, Canada, November.

Danny Green / Polar bear (Ursus maritimus) hunting Seal on sea ice. Svalbard, Norway, July 2018.

Danny Green / Polar bear (Ursus maritimus), two cubs playing, leaping across sea ice, reflected in water. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus), two cubs walking on sea ice. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus) cub ready to jump down from pack ice. Svalbard, Norway, April.

Danny Green / Arctic fox (Alopex lagopus) following scent, in winter pelage. Svalbard, Norway. April.

Danny Green / Arctic fox (Alopex lagopus) camouflaged in winter pelage. Svalbard, Norway, April.

Danny Green / Arctic fox (Alopex lagopus) in snow. Svalbard, Norway. April.

Danny Green / Ringed seal (Pusa hispida) resting on ice, reflected in water. Svalbard, Norway. July.

Phil Savoie / Painted nomad bee (Nomada fucata) male bee with characteristic green eyes, sleeping with jaws locked around grass stem, Monmouthshire, Wales, UK. June

Nick Garbutt / Sumatran pit viper (Trimeresurus sumatranus) juvenile on tree trunk, in tropical rainforest. Danum Valley, Sabah, Borneo, Malaysia.

Tony Wu / Humphead parrotfish (Bolbometopon muricatum) shoal spawning in early morning, part of mass aggregation of thousands of fish. Caroline Islands, Palau.

Alex Mustard / Green turtle (Chelonia mydas) feeding on Seagrass (Halophila stipulacea), blowing sand out of nostrils, on sea floor. Marsa El Shouna, Marsa Alam, Egypt.

Alex Mustard / Green turtle (Chelonia mydas) resting on sea floor and two juvenile Golden trevally (Gnathanodon speciosus). Marsa El Shouna, Marsa Alam, Egypt.

Gary Bell/ Oceanwide / Green Sea Turtle (Chelonia mydas), Heron Island, Great Barrier Reef, Queensland, Australia

Gary Bell/ Oceanwide / Green Sea Turtle (Chelonia mydas), Heron Island, Great Barrier Reef, Queensland, Australia

Alex Mustard / Whale shark (Rhincodon typus) close to the camera with a golden trevally fish (Gnathanodon speciosus) and outline of another whale shark behind , in the plankton-rich green waters of La Paz bay, Baja...

Alex Mustard / RF - Green sea turtle (Chelonia mydas) Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea. Tropical West Pacific Ocean. (This image may be licensed either as rights managed or royalty free.)

Alex Mustard / Portrait of a male short snouted seahorse (Hippocampus hippocampus) in sea oak seaweed (Halidrys siliquosa). Devon, England, United Kingdom. British Isles. English Channel. North East Atlantic Ocean.

Alex Mustard / Green turtle (Chelonia mydas) descending after breathing at the surface. Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea. Tropical West Pacific Ocean.

Lucas Bustamante / Green-crowned woodnymph (Thalaurania fannyi) Mashpi, Pichincha, Ecuador

Nick Upton / Two Dark green fritillary butterflies (Argynnis aglaja) and a Narrow-bordered five-spot burnet moth (Zygaena lonicerae) nectaring on a Greater knapweed flower (Centaurea scabiosa) in a chalk grassland...

Nick Upton / Six-spot burnet moth (Zygaena filipendulae), Marbled white butterflies (Melanargia galathea) and a Dark green fritillary (Argynnis aglaja) nectaring on a clump of Greater knapweed flowers (Centaurea s...

David Gallan / Spotted-tailed quoll (Dasyurus maculatus) scent marking in Monga National Park, New South Wales, Australia. Remote camera, triggered by movement. Highly Commended 2018 Wildlife Photographer Of The Yea...

Nigel Cattlin / Peach leaf curl (Taprina deformans) fungal disease distortion of leaves on a young Peach tree, Berkshire, September.

Nigel Cattlin / Large rose sawfly (Arge pagana) larvae feeding on ornamental rose leaves in summer, Berkshire, September

Nigel Cattlin / Blue colour variation of Green paddy leafhopper, (Nephottetix virescens) a biotype of this pest species

John Shaw / Violet-tailed sylph hummingbird (Aglaiocercus coelestis) in flight, about to land. Ecuador, May.

John Shaw / Large leaves on Pacific blackberry (Rubus ursinus) above bracken fern and horsetail, is a small wet area. Oregon, USA. June.

Shane Gross / Green sea turtle (Chelonia mydas) resting in a coral reef. Eleuthera, Bahamas.

Tui De Roy / Green turtle (Chelonia mydas), female returning to the sea after egg laying, Puerto Pajas, Isabela Island, Galapagos

Georgette Douwma / Colonial anemones (Amphianthus nitidus) with Green urn sea squirts (Didemnum molle) (Atriolum robustum). Lembeh Strait, North Sulawesi, Indonesia.

Nick Hawkins / Juvenile Pollock (Pollachius virens) school within the protective fronds of kelp near Port Joli, Nova Scotia, Canada. August

Nick Hawkins / European green crab (Carcinus maenas), an invasive species in North America, Kejimkujik Seaside National Park, Nova Scotia, Canada. July.

Nick Hawkins / Sugar kelp (Sacchinaria latissima) off Nova Scotia, Canada. September

SCOTLAND: The Big Picture / Creative impression of Silver birch (Betula pendula) foliage, Creagellachie NNR, Cairngorms National Park, Scotland, UK.May

SCOTLAND: The Big Picture / Close up of a colony of Jewel anemones (Corynactis viridis) Scotland, UK, October.

SCOTLAND: The Big Picture / Kelp forest (Laminaria digitata) with small fish, Shetland, Scotland, UK, July.

Steven David Miller / Rainbow lorikeet (Trichoglossus moluccanus) on a branch, Cania Gorge National Park, Queensland, Australia. September.

Marie Read / Ruby-throated Hummingbird (Archilocus colubris), male flying in to feed from cardinal flowers (Lobelia cardinalis) New York, USA. August.

Marie Read / Red-winged Blackbird (Agelaius phoeniceus) male displaying in cattail marsh, Viera Wetlands, Brevard County, Florida, USA, January.

Konrad Wothe / Sword-billed hummingbird (Ensifera ensifera) in flight, North-Ecuador, Ecuador.

Konrad Wothe / Larvae of Birch sawfly (Craesus septentrionalis) in alarm position, Upper Bavaria, Germany. October.

Derek Galon / Damaged forest overgrown by various vines, a typical scene in western part of Dominica, West Indies. After hurricane Maria an unprecedented number of vines took advantage of suddenly open spaces in th...

Ralph Pace / Green Sea Turtle (Chelonia mydas), San Diego, California

Staffan Widstrand / Grey-headed woodpecker (Picus canus) on tree trunk in falling snow. Kalvtrask, Vasterbotten, Lapland, Sweden. January.