Morley Read / Slow motion clip of a South American common toad (Rhinella margaritifera) leaping, Orellana Province, Ecuadorian Amazon.

Morley Read / Close-up portrait of a South American common toad (Rhinella margaritifera) amongst leaf litter, Orellana Province, Ecuadorian Amazon.

Diane McAllister / Polar bears (Ursus maritimus) fighting in water. Beaufort Sea , Kaktovik, Alaska, USA. Highly commended in the Polar Passion category of the Nature's Best Photography Competition 2019.

Nick Garbutt / American bison (Bison bison) female covered in hoar frost near hot spring, portrait. Midway Geyser Basin, Yellowstone National Park, USA. February.

Nick Garbutt / RF - Red fox (Vulpes vulpes) foraging in snow covered valley. Hayden Valley, Yellowstone National Park, USA. February 2019. (This image may be licensed either as rights managed or royalty free.)

John Cancalosi / Sonoran desert toad (Incilius alvarius) pair mating, with trail of spawn in water. Arizona, USA.

Jack Dykinga / Burrowing owl (Athene cunicularia) female and ten chicks aged a few weeks. Marana, Arizona, USA. May.

Jack Dykinga / Greater roadrunner (Geococcyx californianus) running to feed brood with Lizard prey in beak. Catalina State Park, Sonoran Desert, Arizona, USA. June.

Shane Gross / American crocodile (Crocodylus acutus) with open mouth amongst Seagrass (Alismatales). Gardens of the Queen National Park, Cuba.

George Sanker / Great egret (Ardea alba) with prey in beak, in evening light. Myakka River State Park, Florida, USA, March. Sequence 2/2.

George Sanker / Great egret (Ardea alba) diving head into water to catch prey, in evening light. Myakka River State Park, Florida, USA, March. Sequence 1/2.

Jack Dykinga / Bighorm sheep (Ovis canadensis) males grouped together before the rutting season. Valley of Fire State Park, Nevada, USA, February.

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...

Lucas Bustamante / Giant river otter (Pteronura brasiliensis) eating a catfish. Yasuni National Park, Orellana, Ecuador

Lucas Bustamante / Anhinga (Anhinga anhinga). Yasuni National Park, Orellana, Ecuador

Lucas Bustamante / Jaguar (Panthera onca) standing in mud, Yasuni National Park, Orellana, Ecuador

Lucas Bustamante / Zigzag Heron (Zebrilus undulatus) camouflaged in branches while nesting. Yasuni National Park, Ecuador

Lucas Bustamante / Scarlet Macaws (Ara macao) drinking water inside an Amazonian claylick. Yasuni National Park, Orellana, Ecuador

Jack Dykinga / Inspiration point covered in snow, Bryce Canyon National Park, USA, January.

Jack Dykinga / Landscape of hoodoos in snow at sunrise, Bryce Canyon National Park, Utah, USA, January.

Jack Dykinga / Winter snow storms cause wind-blown drifting along the canyon rim, Bryce Canyon National Park, Utah, USA, January.

Jack Dykinga / Sandhill cranes (Antigone canadensis) and Snow geese (Chen caerulescens) at sunrise, Bosque del Apache National Wildlife Refuge, New Mexico, USA, November.

Jack Dykinga / Conifer tree branch covered in snow and frost from winter snow storm. Bryce Canyon National Park, Utah, USA, January.

Jack Dykinga / Bald eagle (Haliaeetus leucocephalus) perched as Snow geese (Chen caerulescens) fly by, Bosque del Apache National Wildlife Refuge, New Mexico, USA, January.

Jack Dykinga / Snow goose (Chen caerulescens) landing into a tight packed flock on lake, Bosque del Apache National Wildlife Refuge, New Mexico, USA. January.

Jack Dykinga / Sandhill cranes (Antigone canadensis) feeding in pond, Bosque del Apache National Wildlife Refuge, New Mexico, USA. January.

Jack Dykinga / Snow goose (Chen caerulescens) landing into flock, Bosque del Apache National Wildlife Refuge, New Mexico, USA, January.

Jack Dykinga / Sandhill cranes (Antigone canadensis) taking off and flying past a full 'super-moon' en route to feeding in neighboring fields. Bosque del Apache National Wildlife Refuge, New Mexico, USA, Jan...

Jack Dykinga / Bryce Canyon National Park, Utah. Bristlecone pine clinging to the canyon rim at dawn, Bryce Canyon National Park, Utah, USA, January.

Ernie Janes / Bald eagle (Haliaeetus leucocephalus) portrait, captive, occurs in North America.

John Chan / Great horned owl (Bubo virginianus) chicks stretching and flapping their wings, Southern California, USA, May.

John Chan / Crenulated fiddler crab (Uca crenulata) waving its major claw at another crab, part of a courtship display, Southern California, USA, June.

John Chan / Crenulated fiddler crab (Uca crenulata) feeding on detritus, Southern California, USA, June.

John Chan / Great horned owl (Bubo virginianus) chick watching for parents to return with food, Southern California, USA, June.

John Chan / Peregrine falcon (Falco peregrinus) plucking Dowitcher (Limnodromus) prey, Southern California, USA.

John Chan / American avocet (Recurvirostra americana) foraging in salt marsh, Southern California, USA.

John Chan / Killdeer (Charadrius vociferus) stamping its feet to create vibrations in the sand as it forages for insects, Southern California, USA, August.

John Chan / California brown pelicans (Pelecanus occidentalis californicus) roosting on a mudflat, with a flock of Elegant terns (Thalasseus elegans) nearby, Southern California, USA May/2019

John Chan / Flock of Western sandpipers (Calidris mauri) taking flight from salt marsh, Southern California, USA.

Jack Dykinga / Border wall with razor wire at the Mexican / United States border in Arizona, where the newer taller sections of the border wall pushed by President Trump are being erected in the environmentally sens...

Jack Dykinga / Bird caught in border wall mesh at the Mexican / United States border, Organ Pipe National Monument, Arizona, USA, August.

Jack Dykinga / Mexican / United States border in Arizona, where the newer taller sections of the border wall pushed by President Trump are being erected in the environmentally sensitive Organ Pipe National Monument....

Jack Dykinga / Mexican / United States border in Arizona, where the newer taller sections of the border wall pushed by President Trump are being erected in the environmentally sensitive Organ Pipe National Monument....

Jack Dykinga / Mexican / United States border in Arizona, where the newer taller sections of the border wall pushed by President Trump are being erected in the environmentally sensitive Organ Pipe National Monument....

Jack Dykinga / Landscape at the older Mexican / United States border wall in Arizona. Newer taller sections of the border wall pushed by President Trump are being erected in this environmentally sensitive Organ Pipe...

John Shaw / Yellow warbler (Setophaga petechia aureola) on lava rocks. Isabela Island, Galapagos. May.

John Shaw / Western screech owl (Megascops kennicottii) is camouflaged as it looks from a tree cavity. Bosque del Apache National Wildlife Refuge, New Mexico, USA, January.

John Shaw / Hybrid Poplar tree plantation in autumn (Populs sp.). Boardman Tree Farm, near Irrigon, Oregon, USA. October.

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

John Shaw / Shoreline of Lake Powell, seen from Alstrom Point on Romana Mesa. Glen Canyon National Recreation Area, on the Arizona/Utah border, USA, January.

John Shaw / Brown bear (Ursus arctos) searching for clams on tidal mudflat with waterbirds. Lake Clark National Park, Alaska. August.

John Shaw / Abandoned house in middle of a wheat field. Palouse farming area, south eastern Washington, USA, August.

John Shaw / Purple gallinule (Porphyrio martinicus) reaches for giant bulrush (Schoenoplectis californicus) seeds. Wakodahatchee Wetlands, Florida, USA, April.

John Shaw / Roseate spoonbill (Platalea ajaja) at its nesting colony site, in early morning light. St. Johns Management Area, Florida, USA, April.

John Shaw / Osprey (Pandion haliaetus) with Atlantic needlefish (Strongylura marina) it has caught. Blue Cypress Lake, Florida, USA, April.

John Shaw / Snowy egret (Egretta thula) shows its breeding plumage. St. Johns Management Area, Florida, USA, March.

John Shaw / Late afternoon light warms the colors in the Yellow Mounds area, Badlands National Park, South Dakota, USA, September.

John Shaw / Pine tree (Pinus sp) in winter, Bryce Canyon National Park, Utah, USA, January.

Francisco Marquez / Greater flamingo (Phoenicopterus ruber) juveniles and a few adults kept temporarily in an enclosure for ringing, Fuente de Piedra lagoon, Malaga, Spain. August.

Francisco Marquez / Greater flamingo (Phoenicopterus ruber) juveniles and a few adults kept temporarily in an enclosure for ringing, Fuente de Piedra lagoon, Malaga, Spain. August.

Francisco Marquez / Volunteers rounding up Greater flamingo (Phoenicopterus ruber) juveniles for ringing, Fuente de Piedra lagoon, Malaga, Spain. August.

Francisco Marquez / Greater flamingo (Phoenicopterus ruber) flock silhouetted in wetland, Fuente de Piedra lagoon, Malaga, Spain. August.

Jack Dykinga / Navajo Sandstone formations with striated lines of mineral deposits. Grand Staircase-Escalante National Monument, Utah

Jack Dykinga / Morning light with autumn coloured Cottonwoods (Populus sp) trees lining the river. Valley of the Gods, Colorado Plateau, of the Great Basin Desert, Utah, USA, November 2018.

Jack Dykinga / Erosion sculpted 'pot-hole' with reflection of clouds at sunset, Muley Point, Cedar Mesa, Bears Ears National Monument, Utah, USA, October 2018.

Jack Dykinga / Rainbow over Long Canyon with fall coloured Cottonwood (Populus) trees against canyon walls, Burr Trail, Grand Staircase-Escalante National Monument, Utah, USA, October 2018.

Jack Dykinga / Waterfall over sandstone with cottonwood tree, Long Canyon , Burr Trail, Grand Staircase-Escalante National Monument, Utah, USA. October.

Jack Dykinga / Sandhill crane (Antigone canadensis) in flight against blue sky, Bosque Del Apache, New Mexico, USA. December.

Jack Dykinga / Sandhill cranes (Antigone canadensis) in flight in late evening light, Bosque Del Apache, New Mexico, USA. December

Jack Dykinga / Flocks of Mallard ducks (Anas platyrhynchos) taking off in tree-lined wetlands. Bosque del Apache National Wildlife Refuge, New Mexico, USA.

Jack Dykinga / Burrowing owls (Athene cunicularia) one moving its head - with blurred motion. Marana, Arizona, USA, November.

Jack Dykinga / Yellow-headed blackbirds (Xanthocephalus xanthocephalus) and Redwing blackbirds (Agelaius phoeniceus) roosting. Whitewater Draw Wildlife Area, Arizona, USA, December.

Jack Dykinga / Murmuration of Yellow-headed blackbirds (Xanthocephalus xanthocephalus) and Redwing blackbirds (Agelaius phoeniceus) at sunset, before roosting. Whitewater Draw Wildlife Area, Arizona, USA, December.

Doc White / Sea Otter, (Enhydra lutris), young male, Elkhorn Slough, California, USA. January

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

Nick Hawkins / Underneath view of a North American beaver (Castor canadensis) swimming under the ice of a frozen river. Quebec, Canada. October.

Nick Hawkins / A female American black bear (Ursus americanus) and her young cub, Nova Scotia, Canada. July.

Nick Hawkins / American lobster (Homarus americana) in eelgrass (Zostera marina). Nova Scotia, Canada. July

John Cancalosi / Great horned owl (Bubo virginianus) chick stretching its wings in nest in a Saguaro (Carnegiea gigantea), is groomed by its parent, Sonoran Desert, Arizona, USA, May.

John Chan / Two male Southern Pacific rattlesnakes (Crotalus oreganus helleri) fighting during mating season. This behaviour is known as a "combat dance", and is used to determine dominance and the right to mate...

John Chan / California sea lion (Zalophus californianus) feeding on a Striped bass (Morone saxatilis), Southern California, USA.

John Chan / Anna's Hummingbird (Calypte anna) chick, sleeping in nest, Southern California, USA, March.

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

SCOTLAND: The Big Picture / Buacaille Etive Mor and River Etive in winter, Rannoch Moor, Glencoe, Scotland, UK.December

Marie Read / Western Grebe (Aechmorphus occidentalis), pair during 'rushing' courtship display in which they run across water's surface in synchrony, near Escondido, California, USA, January.

Marie Read / Wood Ducks (Aix sponsa), females behave aggressively toward a male (second from right) that is trying to join them on a floating log, autumn, New York, USA, October.

Morley Read / Slow motion clip of a South American common toad (Rhinella margaritifera) leaping, Orellana Province, Ecuadorian Amazon.

Morley Read / Close-up portrait of a South American common toad (Rhinella margaritifera) amongst leaf litter, Orellana Province, Ecuadorian Amazon.

Pascal Kobeh / Two Atlantic / American lobsters (Homarus americanus) fighting, Gulf of Saint Lawrence, Canada

Pascal Kobeh / Atlantic / American lobster (Homarus americanus) Gulf of Saint Lawrence, Canada

Pascal Kobeh / Atlantic / American lobster (Homarus americanus) with a Grey seal (Halichoerus grypus ) swimming in the background, Gulf of Saint Lawrence, Canada

Bernard Castelein / Small copper (Lycaena phlaeas) butterfly covered in dew droplets, resting on flowerhead. Klein Schietveld, Brasschaat, Belgium. August.

Bernard Castelein / American oak (Quercus rubra) trees in avenue, sun shining through. Peerdsbos, Brasschaat, Belgium. November 2013.

John Cancalosi / Snapping turtle (Chelydra serpentina) and Bluegill (Lepomis macrochirus) fish attempting to feed on algae on turtle's shell. Maryland, USA. August.

John Cancalosi / Timber rattlesnake (Crotalus horridus) females coiled up in leaf litter, newborn young sheltering under rock. At maternity site, Pennsylvania, USA. August.

John Cancalosi / Timber rattlesnake (Crotalus horridus) females in undergrowth at maternity site, Pennsylvania, USA. August.