Tony Wu / Humpback whales (Megaptera novaeangliae) engaged in bubble net feeding. Alaska, USA, July.

Tony Wu / Humpback whales (Megaptera novaeangliae kuzira) engaged in bubble-net feeding, highlighted by the warm light of a late summer evening. Kupreanof Island, Alaska, USA. July.

Tony Wu / Humpback whale (Megaptera novaeangliae) lying on its side while executing a series of pectoral fin slaps on ocean surface. Vava'u, Tonga, South Pacific.

Tony Wu / Humpback whale (Megaptera novaeangliae australis) female and calf swimming together at depth, ventral surfaces of both whales clearly visible. Vava'u, Tonga, Pacific Ocean.

Tony Wu / Water streaming off of a diving Humpback whale's (Megaptera novaeangliae) fluke, with 42ft Nordic Tug Legend visible in the background. Chantham Strait, Alaska, USA.

Tony Wu / Humpback whale (Megaptera novaeangliae australis) female breaching. Vava'u, Tonga. Pacific Ocean.

Tony Wu / Humpback whale calf (Megaptera novaeangliae) male calf peeking out from underneath his pectoral fin as he swims upside-down beneath the ocean surface. His mother was resting about 20 meters below. Vav...

Tony Wu / Humpback whale calf (Megaptera novaeangliae australis) female nudging her mother's mammary gland whilst trying to feed. Vava;u, Tonga, South Pacific.

Tony Wu / Humpback whale calf (Megaptera novaeangliae australis) male calf launching partially out of the water with his mouth open while playing together with mother. Vava'u, Tonga, Pacific Ocean.

Tony Wu / Humpback whale calf (Megaptera novaeangliae australis) swimming just under the ocean surface, partially backlit by dramatic rays of sunlight. Vava'u, Tonga, Pacific Ocean.

Tony Wu / Humpback whale calf (Megaptera novaeangliae australis). faeces. Defecation like this from calves contributes to the cycling of nutrients from nutrient-rich high latitudes to less nutrient-abundant low...

Tony Wu / Humpback whale calf (Megaptera novaeangliae australis) female calf breaching sequence. Vava'u, Tonga, Pacific Ocean.

Tony Wu / North Pacific humpback whale (Megaptera novaeangliae kuzira) breaching at sunset, Kupreanof Island, Frederick Sound, Alaska, USA, July.

Tony Wu / North Pacific humpback whale (Megaptera novaeangliae kuzira) breaching, Icy Strait, Alaska, USA. July.

Alex Mustard / Killer whale / Orca (Orcinus orca) newborn breaching to breath at the surface in an Arctic fjord in Spildra, northern Norway. This baby was so young that it could not yet breathe properly with its blo...

Alex Mustard / California sea lion (Zalophus californianus) pups in an underwater cave. Los Islotes, La Paz, Baja California Sur, Mexico. Sea of Cortez, Gulf of California, East Pacific Ocean.

Alex Mustard / California sea lion pup (Zalophus californianus) practicings its hunting skills by playing chase with a falling sea star (Panamic cushion star: Pentacerster cumingi). Los Islotes, La Paz, Baja Califor...

Alex Mustard / Pair of California sea lion (Zalophus californianus) pups playing in shallow water. Los Islotes, La Paz, Baja California Sur, Mexico. Sea of Cortez, Gulf of California, East Pacific Ocean.

Staffan Widstrand / Northern palm squirrel (Funambulus pennantii)Keoladeo Ghana National Park, Bharatpur, Rajasthan, India

Staffan Widstrand / Jungle cat (Felis chaus) at night, Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Jungle cat (Felis chaus) at night, Kanha National Park and Tiger Reserve, Madhya Pradesh, India.

Staffan Widstrand / Jungle cat (Felis chaus) at night, Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Jungle cat (Felis chaus) at night, Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Jungle cat (Felis chaus) at night, Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Jungle cat (Felis chaus) at night, Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Jungle cat (Felis chaus) at night, Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Gaur or Indian bison (Bos gaurus / Bos frontalis) Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Barasingha / Swamp deer (Rucervus / Cervus duvaucelii) stag grooming, Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Spotted deer or Chital (Axis axis) stag grooming its back, Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Bengal tiger (Panthera tigris tigris) male resting in waterhole, Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Gaur or Indian Bison (Bos gaurus), Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Bengal tiger (Panthera tigris tigris) male covered in mud, Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Golden jackal (Canis aureus) Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Golden jackal (Canis aureus) with its kill, Spotted deer or Chital (Axis axis) fawn, in Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Golden jackal (Canis aureus) Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Indian flying fox or Greater Indian fruit bat (Pteropus giganteus) in Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / Indian flying fox or Greater Indian fruit bat (Pteropus giganteus) in Kanha National Park and Tiger Reserve, Madhya Pradesh, India

Staffan Widstrand / African savannah elephant (Loxodonta africana) hidden behind bush, trunk and tail visible, Marataba Private Reserve, Marakele National Park, Limpopo, South Africa

Staffan Widstrand / White rhinoceros (Ceratothorium simum) Marataba Private Reserve, Marakele National Park, Limpopo, South Africa

Staffan Widstrand / White rhinoceros (Ceratothorium simum) trying to impress on a female by showing digging skills. Marataba Private Reserve, Marakele National Park, Limpopo, South Africa

Tony Wu / Eden's whale (Balaenoptera edeni) side lunging surrounded by terns, a behaviour which has become prevalent. since 2017. Gulf of Thailand.

Tony Wu / Eden's whale (Balaenoptera edeni edeni) juvenile side-lunging through a mass of fish, Gulf of Thailand.

Tony Wu / Eden's whale (Balaenoptera edeni) female engaged in lunge-feeding behavior with her calf. The mother is on the left side of the image. Gulf of Thailand.

Tony Wu / Sperm whale (Physeter macrocephalus) nostril. This species have a single blowhole on the left side of their heads. The other nostril has been modified into an internal organ called the phonic lip that...

Alex Mustard / RF - Silhouette of a California sea lion (Zalophus californianus) swimming through an underwater cave. Los Islotes, La Paz, Baja California Sur, Mexico. Sea of Cortez, Gulf of California, East Pacific...

Alex Mustard / RF - Blue whale (Balaenoptera musculus) diving vertically down into the ocean to feed. Indian Ocean, off Sri Lanka. (This image may be licensed either as rights managed or royalty free.)

Alex Mustard / Bottlenose dolphin (Tursiops truncatus) pod of four, swimming in the open ocean. Wolf Island, Galapagos National Park, Galapagos Islands.. East Pacific Ocean.

Alex Mustard / Snorkeller looking down on a Blue whale (Balaenoptera musculus) passing beneath. Indian Ocean, off Sri Lanka.

Alex Mustard / Blue whale (Balaenoptera musculus) swimming beneath the surface of the ocean. Indian Ocean, off Sri Lanka.

Alex Mustard / Blue whale (Balaenoptera musculus) swims beneath the surface of the ocean. Indian Ocean, off Sri Lanka.

Alex Mustard / Pod of False killer whales (Pseudorca crassidens) swimming beneath the surface of the ocean. Indian Ocean, off Sri Lanka.

Alex Mustard / Pod of False killer whales (Pseudorca crassidens) swimming beneath the surface of the ocean. Indian Ocean, off Sri Lanka.

Lucas Bustamante / White-bellied spider monkey (Ateles belzebuth) Yasuni National Park, Orellana, Ecuador.

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

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

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

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

Lucas Bustamante / Golden-mantled tamarin (Saguinus tripartitus) Yasuni National Park, Orellana, Ecuador

Lucas Bustamante / Toque Macaques (Macaca sinica) Polonnaruwa, Central Province, Sri Lanka

Lucas Bustamante / Toque Macaques (Macaca sinica) Polonnaruwa, Central Province, Sri Lanka

Lucas Bustamante / A group of Tufted Gray Langurs (Semnopithecus priam) Polonnaruwa, Central Province, Sri Lanka

Lucas Bustamante / A group of Tufted Gray Langurs (Semnopithecus priam) Sigiriya, Central Province, Sri Lanka

Lucas Bustamante / Toque macaques (Macaca sinica) close to a Buddha statue. Polonnaruwa, Central Province, Sri Lanka

Lucas Bustamante / Sri Lankan leopard (Panthera pardus kotiya) rolling on its back, Yala National Park, Sri Lanka

Lucas Bustamante / Spix's night monkeys (Aotus vociferans) in a tree hole, Yasuni National Park, Orellana, Ecuador

Lucas Bustamante / Sri Lankan elephant (Elephas maximus maximus) walking past tourist jeep with tourists, Yala National Park, Southern Province, Sri Lanka

Lucas Bustamante / A group of Tufted Gray Langurs (Semnopithecus priam) fighting, Yala National Park, Southern Province, Sri Lanka

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

Nick Upton / Roe deer (Capreolus capreolus) doe grooming itself and then grazing on a garden lawn, Wiltshire, England, UK, February.

Nick Upton / Roe deer (Capreolus capreolus) doe grazing on Common ivy (Hedera helix) from a garden hedge, Wiltshire, England, UK, February.

Nick Upton / Eurasian beaver (Castor fiber) grazing aquatic vegetation, River Otter, Devon, England, UK, June.

Franco Banfi / Sperm whale (Physeter macrocephalus), trying to move away a calf to mate with a female, Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Sperm whale (Physeter macrocephalus) try to move away a calf, in order to mate with a female, Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Freediver swimming with female Sperm whale (Physeter macrocephalus) Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Sperm whale mother and calf, (Physeter macrocephalus), Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Free diver is swimming over a pod of Sleeping sperm whale (Physeter macrocephalus) Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Snorkeler photographing a pod of Sleeping sperm whale (Physeter macrocephalus) Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Sperm whale (Physeter macrocephalus) sleeping. Dominica, Caribbean Sea, Atlantic Ocean.

Fabio Pupin / Onager (Equus hemionus), Negev desert, Israel, April.

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...

Franco Banfi / Tail of Sperm whale, (Physeter macrocephalus). Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Sleeping sperm whale, (Physeter macrocephalus) Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Sperm whale, (Physeter macrocephalus) Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Sperm whale mother and calf, (Physeter macrocephalus) Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Pod of sleeping Sperm whale (Physeter macrocephalus) Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Pod of sperm whale socializing, (Physeter macrocephalus), Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Pod of sperm whale, (Physeter macrocephalus), Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Pod of Sperm whale socializing, (Physeter macrocephalus) Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Sperm whale surfacing, (Physeter macrocephalus).Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Pod of Sperm whalea (Physeter macrocephalus) with mother and calf, Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Sperm whale, (Physeter macrocephalus) pair, Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Pod of Short-finned pilot whales, (Globicephala macrorhynchus) pod, Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Tail of Sperm whale (Physeter macrocephalus) Vulnerable (IUCN), Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Pod of sperm whale swimming, (Physeter macrocephalus), Dominica, Caribbean Sea, Atlantic Ocean.

Franco Banfi / Sperm whale, (Physeter macrocephalus) sleeping, Dominica, Caribbean Sea, Atlantic Ocean.

Oriol Alamany / Snow leopard (Panthera uncia) walking in snow, in Spiti Valley, Cold Desert Biosphere Reserve, Himalaya