Tony Wu / Humpback whale (Megaptera novaeangliae) pursuing Herring (Clupea sp) school. Hamn, Senja, Norway. January.

Tony Wu / Humpback whale (Megaptera novaeangliae australis) with calf, female resting at surface, calf playing. Vava'u, Tonga.

Nick Garbutt / Greater dwarf lemur (Cheirogaleus major) in rainforest canopy at night. Masoala National Park, Madagascar.

Nick Garbutt / Tsiombikibo sportive lemur (Lepilemur ahmansonorum). Tsiombikibo forest, north western Madagascar.

Nick Garbutt / Amber mountain fork-marked lemur (Phaner electromontisi). Daraina forest, northern Madagascar.

Nick Garbutt / Golden-brown mouse lemur (Microcebus ravelobensis) active at night. Ankarafantsika National Park (Ampijoroa), north west Madagascar.

Nick Garbutt / Madame Berthe's mouse lemur (Microcebus berthae) at night. Kirindy forest, western Madagascar. (world's smallest primate)

Nick Garbutt / Bornean pygmy squirrel (Exilisciurus exilis) on tree trunk with human hand for actual size comparision. Kinabatangan River, Sabah, Borneo. (composite image)

Nick Garbutt / Daraina sportive lemur (Lepilemur milanoii). Daraina forest, northern Madagascar.

Nick Garbutt / Daraina sportive lemur (Lepilemur milanoii). Daraina forest, northern Madagascar.

Nick Garbutt / Golden bamboo lemur (Hapalemur aureus) in forest understory. Ranomafana National Park, south east Madagascar.

Nick Garbutt / Ankarana sportive lemur (Lepilemur ankaranensis). Ankarana National Park, northern Madagascar.

Nick Garbutt / Petter's sportive lemur (Lepilemur petteri). Ifaty forest, south western Madagascar.

Nick Garbutt / Grey-brown mouse lemur (Microcebus griseorufus). Ifaty spint forest, south western Madagascar.

Nick Garbutt / Petter's sportive lemur (Lepilemur petteri). Ifaty forest, south western Madagascar.

Nick Garbutt / Zombitse sportive lemur (Lepilemur hubbardorum). Zombitse Forest, south west Madagascar.

Nick Garbutt / Zombitse sportive lemur (Lepilemur hubbardorum). Zombitse Forest, south west Madagascar.

Nick Garbutt / Goodman's mouse lemur (Microcebus lehilahytsara) at night. Andasibe-Mantadia National Park, east Madagascar.

Nick Garbutt / Madame Berthe's mouse lemur (Microcebus berthae) left, world's smallest primate, and Grey mouse lemur (Microcebus murinus) right, held in hand for comparison. Kirindy forest, western Madagasca...

Nick Garbutt / Madame Berthe's mouse lemur (Microcebus berthae) at night. Kirindy forest, western Madagascar. (world's smallest primate)

Nick Garbutt / White-footed sportive lemur (Lepilemur leucopus). Berenty forest, southern Madagascar.

Nick Garbutt / Masoala sportive lemur or Scott's sportive lemur (Lepilemur scottorum) active in forest understory at night (nocturnal species). Masoala Peninsula, north east Madagascar.

Nick Garbutt / Fat-tailed dwarf lemur (Cheirogaleus medius). Kirindy forests, west Madagascar.

Nick Garbutt / Ankarana dwarf lemur (Cheirogaleus shethi) in forest understory. Ankarana Reserve forests, northern Madagascar.

Nick Garbutt / Adult brown or rufus mouse lemur (Microcebus rufus) at night. Ranomafana National Park, south east Madagascar.

Nick Garbutt / Adult Groves' dwarf demur (Cheirogaleus major) in rainforest at night. Ranomafana National Park, South East Madagascar.

Nick Garbutt / Mittermeier's sportive lemur (Lepilemur mittermeieri). Ampasandava Peninsula forest, snorth west Madagascar.

Nick Garbutt / Ankarana dwarf lemur (Cheirogaleus shethi) in forest understory. Ankarana Reserve forests, northern Madagascar.

Danny Green / Brown Hare (Lepus europaeus) portrait in grasslands. Leicestershire, UK, May.

Danny Green / Brown Hare (Lepus europaeus) portrait in grasslands. Leicestershire, UK, May.

Danny Green / Brown Hare (Lepus europaeus) portrait in grasslands. Leicestershire, UK, May.

Danny Green / Beaver (Castor fiber) kits feeding on vegetation. Finland, July.

Danny Green / Beaver (Castor fiber) two adults grooming each other, Finland, July.

Danny Green / Beaver (Castor fiber) adult swimming, Finland, July.

Danny Green / Beaver (Castor fiber) adult feeding along the waters edge. Finland, July.

Danny Green / European badger (Meles meles) cub in grassland. Scotland, UK, August.

Danny Green / European badger (Meles meles) cub in grassland. Scotland, UK, August.

Danny Green / European badger (Meles meles) cub in grassland. Scotland, UK, August.

Danny Green / European badger (Meles meles) at night. Scotland, UK, August.

Danny Green / European badger (Meles meles) in woodland. Scotland, UK. August.

Danny Green / European badger (Meles meles) in woodland. Scotland, August.

Danny Green / Red Squirrel (Sciurus vulgaris) resting on a branch in Autumn colours. Norway, September.

Danny Green / Red Squirrel (Sciurus vulgaris) on a branch in Autumn colours. Norway, September.

Danny Green / Red Squirrel (Sciurus vulgaris) resting on a branch in Autumn colours. Norway, September.

Danny Green / European river otters (Lutra lutra) reflection in the water at night. Lincolnshire, UK, September.

Danny Green / European river otter (Lutra lutra) and reflection at night. Lincolnshire, UK, July.

Danny Green / European river otter (Lutra lutra) at night. Lincolnshire, UK, September.

Danny Green / European river otter (Lutra lutra) at night. Lincolnshire, UK, September.

Danny Green / European river otter (Lutra lutra) reflected in water at night. Lincolnshire, UK, September.

Danny Green / European river otter (Lutra lutra) reflected in water at night. Lincolnshire, UK, September.

Danny Green / European river otter (Lutra lutra) in mist reflected in water at night. Lincolnshire, UK, September.

Danny Green / European river otter (Lutra lutra) reflected in water at night. Lincolnshire, UK, September.

Staffan Widstrand / Eurasian brown bear (Ursus arctos) male, Jarbo, Sweden

Staffan Widstrand / Eurasian brown bear (Ursus arctos) male, Jarbo, Sweden

Staffan Widstrand / Eurasian badger (Meles meles) Jarbo, Sweden

Staffan Widstrand / Eurasian badger (Meles meles) Jarbo, Sweden

Staffan Widstrand / Eurasian badger (Meles meles) Jarbo, Sweden

Staffan Widstrand / Eurasian red squirrel (Sciurus vulgaris) Jarbo, Sweden

Sirachai Arunrugstitchai / Caretaker from the 'Dugong Guards', a local volunteer group holding 'Marium', an orphaned Dugong (Dugong dugon) that was rescued from stranding, Koh Libong Island, Trang Province, Thai...

Sirachai Arunrugstitchai / Orphaned Dugong (Dugong dugon) named 'Marium' that was rescued from stranding for rehabilitation feeding seagrass from caretaker. Raised in wild in natural seagrass bed at Koh Libong Island, T...

Sirachai Arunrugstitchai / Orphaned Dugong (Dugong dugon) named Marium that was rescued from stranding for rehabilitation feeds on formula milk given by a caretaker while being raised in the wild without captivity. In the natur...

Sirachai Arunrugstitchai / Dugong (Dugong dugon) baby, named Marium emerges from the murky water of the natural seagrass bed, Andaman Sea, Thailand, Koh Libong Island, Trang Province, Thailand, May 2019. Marium was raised in se...

Konrad Wothe / Man holding shot Cuscus (Phalangeridae), baby still alive in pouch. Eastern Highlands, Papua New Guinea. 2019.

Konrad Wothe / Flying fox (Pteropus sp) group sleeping in tree. Morobe Province, Papua New Guinea.

Konrad Wothe / Flying fox (Pteropus sp) group sleeping in tree. Morobe Province, Papua New Guinea.

Ernie Janes / RF - Brown Rats (Rattus norvegicus) in farm barn , England, UK. (This image may be licensed either as rights managed or royalty free.)

Ernie Janes / RF - Brown hare (Lepus europaeus) feeding on grass, Norfolk, England, UK. June. (This image may be licensed either as rights managed or royalty free.)

Ernie Janes / RF - White-faced saki (Pithecia pithecia) waving hand, Captive portrait, occurs in South America. (This image may be licensed either as rights managed or royalty free.)

Oscar Dewhurst / European rabbit (Oryctolagus cuniculus) feeding in long grass. Suffolk, UK. May.

Oscar Dewhurst / European badger (Meles meles) running across open ground, London, UK. July.

Andy Rouse / RF - European hare, (Lepus europaeus), in grassland, UK (This image may be licensed either as rights managed or royalty free.)

Andy Rouse / European hare, (Lepus europaeus), in golf course bunker, UK

Andy Rouse / European hare, (Lepus europaeus), in grassland - golf driving range, UK

Andy Rouse / European hare, (Lepus europaeus), in habitat , UK

Andy Rouse / European hare, (Lepus europaeus), at sunrise, UK

Andy Rouse / European hare, (Lepus europaeus), at sunrise, UK

Andy Rouse / European hare, (Lepus europaeus), courtship boxing / chasing, UK

Andy Rouse / European hare, (Lepus europaeus), in grassland, UK

Andy Rouse / European hare, (Lepus europaeus), at sunrise with morning dew, UK

Andy Rouse / European hare, (Lepus europaeus), at sunrise, UK

Andy Rouse / European hare, (Lepus europaeus), at sunrise, UK

Andy Rouse / RF - European hare, (Lepus europaeus), at sunrise, UK (This image may be licensed either as rights managed or royalty free.)

Andy Rouse / European hare, (Lepus europaeus), in grassland, UK

Andy Rouse / European hare, (Lepus europaeus), in grassland, UK

Andy Rouse / European hare, (Lepus europaeus), in grassland, UK

Andy Rouse / European hare, (Lepus europaeus), in meadow, UK

Andy Rouse / RF - European hare, (Lepus europaeus), in meadow, UK (This image may be licensed either as rights managed or royalty free.)

Andy Rouse / RF - European hare, (Lepus europaeus), in grassland, UK (This image may be licensed either as rights managed or royalty free.)

Stephen Dalton / Brown rat (Rattus norvegicus) leaping from dustbin, Sussex, England.

David Perpinan / Domestic sheep investigating sheep carcass, Cuenca, Spain, April.

David Perpinan / Domestic sheep investigating sheep carcass before walking away, Cuenca, Spain, April.

Shane Gross / Dugong (Dugong dugon) feeding on Tapegrass (Halophila stipulacea), view of tail. Marsa Alam, Egypt.

Shane Gross / Dugong (Dugong dugon) feeding on Tapegrass (Halophila stipulacea), accompanied by juvenile Golden trevally fish (Gnathanodon speciosus). Marsa Alam, Egypt.

Shane Gross / Dugong (Dugong dugon) male and juvenile Golden trevally (Gnathanodon speciosus) shoal swimming over Turtlegrass (Halophila stipulacea) seagrass bed. Marsa Alam, Egypt.

Shane Gross / Dugong (Dugong dugon) male and juvenile Golden trevally (Gnathanodon speciosus) shoal swimming over Turtlegrass (Halophila stipulacea) seagrass bed. Marsa Alam, Egypt.

Shane Gross / Dugong (Dugong dugon) male feeding on Turtlegrass (Halophila stipulacea) alongside juvenile Golden trevally (Gnathanodon speciosus) shoal, in seagrass bed. Marsa Alam, Egypt.