Edwin Giesbers / Umbilicate woodcock orchid (Ophrys umbilicata) flowers. Cyprus. April.

Loic Poidevin / Golden jackal (Canis aureus) portrait. Danube Delta, Romania, May.

Klein & Hubert / Mangalica Wool Pig (Sus scrofa domesticus), head portrait of boar, Germany.

Wim van den Heever / Julia heleconia (Dryas julia) butterfly on head of Yacare caiman (Caiman yacare) Pantanal, Brazil.

Dave Watts / Koala (Phascolarctos cinereus), eating Eucalyptus leaves, Victoria, Australia.

Klein & Hubert / Laughing gull (Leucophaeus atricilla) in flight over Caribbean sea with fish below surface, Bahamas.

Krijn Trimbos / Great crested grebe (Podiceps cristatus) pair in courtship display, The Netherlands. March.

Espen Bergersen / Common guillemot (Uria aalge) calling, bridled guillemot morph with white ring around the eye, Hornoya bird cliff, Finnmark, Norway. March.

Cyril Ruoso / Chimpanzee (Pan troglodytes) close up portrait, Bakoumba sanctuary, Gabon. Non-ex

Theo Webb / Female Bonobo (Pan paniscus) tickling her infant, Max Planck research site LuiKotale, Salonga National Park, Democratic Republic of Congo.

Anup Shah / Spotted hyena (Crocuta crocuta) walking and smelling the ground. Maasai Mara National Reserve, Kenya.

Anup Shah / White-backed vultures (Gyps africanus) waiting for Spotted hyenas (Crocuta crocuta) to finish feeding on a kill. Maasai Mara National Reserve, Kenya.

Nick Garbutt / Yacare Caiman (Caiman yacare) gaping to regulate its body temperature, with attendant hoverflies, the Paraguay River, Taiama Reserve, western Pantanal, Brazil, South America.

Nick Upton / Grey seal (Halichoerus grypus) pup aged one month, rubbing its head with its flipper, yawning and settling down to rest on a sandy beach, Norfolk, England, UK, January.

Anup Shah / Spotted hyena (Crocuta crocuta) approaching with curiosity. Masai Mara National Reserve, Kenya. Taken with remote wide angle camera.

Anup Shah / Spotted hyena (Crocuta crocuta) aged about 2 years watching with curiosity with the rest of the clan in the background. Masai Mara National Reserve, Kenya. Taken with remote wide angle camera.

Anup Shah / Spotted hyena (Crocuta crocuta) pup approaching with curiosity. Masai Mara National Reserve, Kenya. Taken with remote wide angle camera.

Anup Shah / Spotted hyenas (Crocuta crocuta) approaching with curiosity. Masai Mara National Reserve, Kenya. Taken with remote wide angle camera.

Anup Shah / Spotted hyena (Crocuta crocuta) approaching with curiosity. Masai Mara National Reserve, Kenya. Taken with remote wide angle camera.

Denis-Huot / Spotted hyena (Crocuta crocuta) hunting Lesser flamingoes (Phoenicopterus minor) Lake Nakuru, Kenya

Denis-Huot / Spotted hyena (Crocuta crocuta) baby at den, Masai-Mara Game Reserve, Kenya

Jurgen Freund / Island children playing in the sea after school. They spend the whole time there until it gets dark and are called home for dinner. M'buke Island, New Ireland, Papua New Guinea, June 2010.

Andy Rouse / Mountain Gorilla (Gorilla beringei) adult playing with an infant. Rwanda, Africa

Kevin Schafer / Two Amazon river dolphins / Botos (Inia geoffrensis) swimming underwater in flooded rainforest, one with beak open, Rio Negro, Amazonia, Brazil, July

David Tipling / Young boy and girl playing in Bluebell (Hyacinthoides non-scripta) wood, Norfolk, UK, May. Model released.

Gerrit Vyn / Laughing Gull (Leucophaeus atricilla) juvenile, heavily oiled as a result of the BP Deepwater Horizon oil spill in the Gulf of Mexico. Baldwin County, Alabama. USA, June 2010.

Jerry Monkman / Young girl boogie boarding at Hampton Beach, New Hampshire, USA, August 2008. Model released.

Uri Golman / Portrait of photographer Uri Golman with Greenland husky sled dog, North East Greenland. March 2009. Model released

David Tipling / Child playing amongst Bluebells, Norfolk, UK, May, model released

Bernard Castelein / Young grey seal (Halichoerus grypus) lying on sand, Helgoland, Germany

Bernard Castelein / Grey seal (Halichoerus grypus) yawning on beach, Helgoland, Germany. Second Place in the Comedy Award of the Terre Sauvage Nature Images Awards 2016.

Laurent Geslin / Three Fulani children laughing, South Mauretania, West Africa, 2005

Carol Walker / Blue Roan Wild Stallion yawning {Equus caballus} Pryor Mountains, Montana, USA.

Ross Hoddinott / RF- Bee orchid (Ophrys apifera). Cornwall, UK. (This image may be licensed either as rights managed or royalty free.)

Tom Vezo / Laughing gull {Leucophaeus atricilla} swallowing large fish, Texas, USA.

Tom Vezo / Laughing gull {Leucophaeus atricilla} portrait in shallow water, USA.

Tom Vezo / Laughing gull {Leucophaeus atricilla} in flight, USA.

Jabruson / Rwandan children laughing, Kinigi, Parc des Volcans NP, Rwanda

Jabruson / Young Chimpanzee playing with park warden {Pan troglodytes schweinfurthii} Virunga NP, Dem Rep of Congo

Ingo Arndt / Hamadryas baboon male threat display {Papio hamadryas} Africa

Richard Du Toit / Burchell's zebra barking {Equus quagga} South Africa Not available for ringtone/wallpaper use.

Anup Shah / Ostrich yawning, eye shut, beak open {Struthio camelus}, Masai Mara Game Reserve, Kenya

Suzi Eszterhas / Spotted Hyena (Crocuta crocuta) adult female yawning at den, Masai Mara National Reserve, Kenya

Mike Parry / Saltwater Crocodile (Crocodylus porosus) swimming, Oro Bay, Papua New Guinea

Richard Du Toit / Burchell's Zebra (Equus burchellii) close-up of face of braying animal, Hluhluwe-umfolozi Game Reserve, South Africa

Chien Lee / Chestnut-capped Laughingthrush (Garrulax mitratus), Kinabalu National Park, Sabah, Malaysia

Debapratim Saha/ BIA / Greater Necklaced Laughingthrush (Garrulax pectoralis), West Bengal, India

Eric Sohn Joo Tan/ BIA / Red-tailed Laughingthrush (Garrulax milnei), Yunnan, China