Carol Walker / Head portrait of grey Arabian stallion running in desert dunes near Dubai, United Arab Emirates.

Alex Mustard / Lion's mane jellyfish (Cyanea capillata) with feeding tentacles spread swimming in the sun in shallow water. Gulen, Norway. North East Atlantic Ocean.

Wim van den Heever / Lion (Panthera leo) male with scars photographed with side-lit spot light at night. Greater Kruger National Park, South Africa, April.

Juan Carlos Munoz / Close up of horse wearing bridle, Sierra de Gredos, Avila, Castile and Leon, Spain.

Juan Carlos Munoz / Close up of horse wearing bridle, Sierra de Gredos, Avila, Castile and Leon, Spain.

Pascal Pittorino / Przewalski's horse (Equus ferus przewalski) head portrait, captive, Lozere, France, December.

Cyril Ruoso / Icelandic horses, group of three interacting, Iceland, August. Non-ex

Denis-Huot / African lion (Panthera leo) male shaking water off mane after rain, Masai-Mara Game Reserve, Kenya. September.

Terry Whittaker / Portrait of Skewbald Icelandic horse in the snow, Snaefellsnes Peninsula, Iceland, March.

Will Burrard-Lucas / Head portrait of male Lion (Panthera leo), Masai Mara, Kenya.

Mary McDonald / African lion (Panthera leo), resting on a rock, surrounded by flies, Masai Mara Game Reserve, Kenya. November.

Denis-Huot / Lion (Panthera leo) male with bloody mane and flies, Masai-Mara Game Reserve, Kenya

Denis-Huot,Denis-Huot / Lions (Panthera leo) mating, Masai-Mara Game Reserve, Kenya

Andy Rouse / African Lion (Panthera leo) male emerging from bush, Masai Mara, Kenya

Denis-Huot,Denis-Huot / Lion (Panthera leo) male using 'flehmen response' to smell, Masai-Mara Game Reserve, Kenya. Vulnerable species.

Denis-Huot,Denis-Huot / Lion (Panthera leo) male, Masai-Mara Game Reserve, Kenya. Vulnerable species.

Denis-Huot,Denis-Huot / Lion (Panthera leo) mating, Masai-Mara Game Reserve, Kenya. Vulnerable species.

Philippe Clement / Poitou donkey (Equus africanus asinus) with shaggy coat on the island Ile de Re, Charente-Maritime, France

Kristel Richard / Portrait of a grey Andalusian stallion, in Ciutadella, Menorca, Spain.

Carol Walker / Black Friesian stallion, head neck portrait, Ojai, California, USA

Carol Walker / Wild Horse / Mustang shaking head and mane, Adobe Town Herd Area, southwestern Wyoming, USA, WINNER OF WILD HORSE SECTION, EQUINE IDEAL PHOTOGRAPHY CONTEST 2012

Kristel Richard / A purebred Lusitano colt (with his mane and tail cut to mark his first year) trotting in the arena at the Companhia das Lezírias Stud Farm, Samora Correia, Santarém, Portugal, July 2011

Mark Hamblin / 2020VISION / Red deer (Cervus elaphus) stag in pine woodland in winter, Cairngorms National Park, Scotland, UK, February. Did you know? British red deer are different to European red deer, having a shorter tail an...

Eric Baccega / Comtois Horse (Equus caballus). Camargue reserve, Rhone, France, September.

Pete Oxford / African Lion (Panthera leo) male portrait, Moremi Game Reserve, Okavango Delta, Botswana

Brent Stephenson / Iceland Pony (Equus caballus) portrait. Faroe Islands, July.

Kristel Richard / Konik horses (Equus caballus) - wild Konik filly, Millingerwaard nature reserve, Netherlands, April

Carol Walker / Grey Andalusian / Spanish stallion running, California, USA

Orsolya Haarberg / Icelandic horses out in the snow, Iceland, April 2010

Kristel Richard / A grey Arab Barb stallion cantering in paddock at the National Stud of Meknes, Morocco, June 2010

Aflo / ic-07002 Horse galloping {Equus caballus}

Aflo / ic-07106 Arab Horses galloping {Equus caballus}

ZSSD / African Lion (Panthera leo) male, native to Africa

Kristel Richard / A Shagya Arab stallion (Equus caballlus) is shown in hand in the courtyard of the Babolna Arabian Stud, Babolna, Komarom-Esztergom, Hungary.

Kristel Richard / Head portrait of a Classic pony stallion (Equus caballus) and one of his mares, in Auvergne, France.

Kristel Richard / Head portrait of a rare grey Yorkshire Dales gelding (Equus caballus) with long mane, at Glanusk Estate, Wales, UK

LYNN M. STONE / Domestic horse, Arabian Horse trotting through brushy meadow, Fort Bragg, California, USA

George Sanker / Male African lion (Panthera leo) lying in grass at sunrise, Masai Mara National Reserve, Kenya, January

Wild Wonders of Europe / Sá / Lion's mane jellyfish (Cyanea capillata) Mull, Scotland, June 2009

Wild Wonders of Europe / Sá / Lion's mane jellyfih (Cyanea capillata) with diver photographing it, Mull, Scotland, June 2009

Mark Bowler / Minature Shetland Pony {Equus caballus} in snow, UK

Juan Carlos Munoz / Close up of muzzle and mane of Shetland Pony, Shetland Islands, Scotland, UK

Winfried Wisniewski / African Lion (Panthera leo) male, Masai Mara National Reserve, Kenya

Carol Walker / Palomino Lusiatano stallion running in paddock, Ojai, California, USA

Scott Leslie / Lion's Mane (Cyanea capillata) jellyfish, Atlantic Ocean, Nova Scotia, Canada

Carol Walker / Bay Thoroughbred {Equus caballus} gelding, Longmont, Colorado, USA.

Pete Oxford / Male lion stretching. (Panthera leo) Botswana. Okavango delta. Black mane

Richard Du Toit / African Lion (Panthera leo) male portrait, Chobe National Park, Botswana

Yva Momatiuk & John Eastcott / African Lion (Panthera leo) adult male with full mane, walking in grassland, Masai Mara National Reserve, Kenya

Thomas Mangelsen / African Lion (Panthera leo) male portrait, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / African Lion (Panthera leo) adult male with full mane roaring to assert dominance, Masai Mara National Reserve, Kenya

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) stallion yawning in evening sunlight, Wyoming

Anup Shah / Male Lion (Panthera leo) above other lion's back. Masai Mara NR, Kenya, East Africa

Anup Shah / Male Lion head portrait {Panthera leo} Kenya, East Africa

Anup Shah / Subadult Lions affectionate greeting {Panthera leo} Masai Mara NR Kenya, East Africa

Anup Shah / Male lion face portrait {Panthera leo} Masai Mara, Kenya, East Africa

Peter Lewis / Bearded tooth fungus / Tree hedgehog fungus (Hericium erinaceus) Droxford, Hampshire, England, UK.

Peter Lewis / Bearded tooth fungus / Tree hedgehog fungus (Hericium erinaceus) Droxford, Hampshire, England, UK.

Peter Lewis / Bearded tooth fungus / Tree hedgehog fungus (Hericium erinaceus) Droxford, Hampshire, England, UK.

Ann & Steve Toon / Lion (Panthera leo) male with dark mane, Kgalagadi Transfrontier Park, South Africa.

Ann & Steve Toon / Lion (Panthera leo) male with dark mane contact calling, Kgalagadi Transfrontier Park, South Africa.

Carol Walker / Sable Island horse, two stallions standing on beach, on windy day. Sable Island, Nova Scotia, Canada. August.

Nigel Cattlin / Lawyers' wig fungus (Coprinus comatus) fruiting caps in grassland. Berkshire, England, UK.

Nick Hawkins / Lions mane jellyfish (Cyanea capillata) drifts in the current near Port Joli, Nova Scotia, Canada. June

Nick Hawkins / Lions mane jellyfish (Cyanea capillata) drifts over intertidal seaweeds off Nova Scotia, Canada. July

Nick Hawkins / Lions mane jellyfish (Cyanea capillata) drifts in the current off Nova Scotia, Canada. July

Nick Hawkins / Lions mane jellyfish (Cyanea capillata) drifts in the current near Port Joli, Nova Scotia, Canada. July

TJ Rich / Dappled grey Arab horse in stable. Wiltshire, UK

Andy Rouse / African Lion (Panthera leo) male at sunrise, Masai Mara, Kenya

Andy Rouse / African Lion (Panthera leo) male at sunrise, Masai Mara, Kenya

Andy Rouse / African Lion (Panthera leo) male walking at sunrise, Masai Mara, Kenya

Kristel Richard / Lion (Panthera leo) portrait, South Luangwa National Park, Zambia. August

Kristel Richard / Lion (Panthera leo) portrait, South Luangwa National Park, Zambia. August

Anup Shah / Lion (Panthera leo) male walking, remote camera. Masai Mara National Reserve, Kenya.

Anup Shah / Lion (Panthera leo) male walking - remote camera. Masai Mara National Reserve, Kenya.

Franco Banfi / Lion's mane jellyfish (Cyanea capillata). Tasiilaq, East Greenland. April.

Kristel Richard / Portrait of a wild stallion (Equus caballus), in the Cincar mountains, near Livno, Bosnia and Herzegovina.

Ashley Cooper / American buffalo (Bison bison) grazing on land reclaimed from a former tar sands mine at Syncrude Mildred Lake, north of Fort McMurray, Alberta, USA. August.

Ashley Cooper / American buffalo (Bison bison) grazing on land reclaimed from a former tar sands mine at Syncrude Mildred Lake, north of Fort McMurray, Alberta, USA. August.

Ashley Cooper / Lions mane jellyfish (Cyanea capillata) washed ashore on a Northumberland Beach, England, UK. July 2014

Ashley Cooper / Girl looking at Lions mane jellyfish (Cyanea capillata), washed ashore on a Nothumberland Beach, England, UK. July 2014

Tony Heald / Lion (Panthera leo), male shaking mane. Mana Pools National Park, Zimbabwe.

Jeff Foott / Maasai, young warriors, one with lion mane head dress. Maasai Village, Kenya. September 2006.

Jeff Foott / Maasai, young warriors, one with lion mane head dress. Maasai Village, Kenya. September 2006.

Jeff Foott / Maasai, young warriors, two with lion mane head dress. Maasai Village, Kenya. September 2006.

Francisco Marquez / Close up of branded mark on horse. Mares and foals are caught into corrals where each yeguero (owner of the mares) identifies their animals, separates the foals from their mothers, worm them, cut the...

Francisco Marquez / Branding irons heating in fire. Mares and foals are caught into corrals where each yeguero (owner of the mares) identifies their animals, separates the foals from their mothers, worm them, cut their...

Francisco Marquez / Man cutting foal's mane. During the round up of mares and foals are caught into corrals where each yeguero (owner of the mares) identifies their animals, separates the foals from their mothers, worm t...

Francisco Marquez / Man cutting foal's mane. During the round up of mares and foals are caught into corrals where each yeguero (owner of the mares) identifies their animals, separates the foals from their mothers, worm t...

Francisco Marquez / Man with scissors for cutting foal's mane. During the round up of mares and foal's are caught into corrals where each yeguero (owner of the mares) identifies their animals, separates the foals from t...

Francisco Marquez / Mares and foals in corral, with man pulling mare towards him. During the round up of mares and foals each yeguero (owner of the mares) identifies their animals, separates the foals from their mothers,...

Francisco Marquez / Foals are driven into corrals where each yeguero (owner of the mares) i identifies their animals, separates the foals from their mothers, worm them, cut their mane and brand them before sale. Donana N...