Laurent Geslin / Close up of an eye of a Racing horse (Equus caballus) France

Laurent Geslin / Race horse (Equus caballus) with face mask to protect it from flies, France

Kristel Richard / An equine trainer, in the traditional white Gujarati clothes, walks a Kathiawari horse mare on her hindlegs without strain, Porbandar, Gujarat, India, December 2012. No release available.

Kristel Richard / A two-year old Kathiawari horse filly free jumping,Porbandar, Gujarat, India. Sequence 2 out out of 8.

Ben Lascelles / Tibetan wild ass / kiang / khyang / gorkhar (Equus kiang) grazing near Lake Rakshastal (the 'lake of the demon') Tibet

Mark MacEwen / Grevy's zebra (Equus grevyi) close-up of coat, Ol Pejeta Conservancy, Kenya, Africa.

Neil Aldridge / Common Zebra (Equus quagga) head detail portrait, Kruger National Park, South Africa

Kristel Richard / Lady riding a black Menorquin stallion, performing the bot or walking courbette of the Doma Menorquina, during the festival Mare de Deu de Gracia, in Mahon, Menorca, Spain 2012. Tourists are trying t...

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

Kristel Richard / Wild Chincoteague (Equus caballus) two breeding stallions greeting one another, Chincoteague National Wildlife Refuge, Chincoteague Island, Virginia, USA, June

Anup Shah / Common or Plains zebra (Equus quagga burchellii) lying dead on the savanna grassland, Masai Mara National Reserve, Kenya, March

Anup Shah / Common or Plains zebra (Equus quagga burchellii) Masai Mara National Reserve, Kenya, September