Kristel Richard / A wild Misaki-uma breeding stallion (right) brings back one of his mares to his band while another breeding stallion (left) charges him away, in the Cape Toi Reserve, Miyazaki Prefecture, Kyushu Islan...

Kristel Richard / A Sika deer stag rests among a band of wild Misaki-uma horses (Equus ferus caballus) in the Cape Toi Reserve, Miyazaki Prefecture, Kyushu Island, Japan.

Roland Seitre / Gobi Jerboa (Allactaga bullata) hopping. Mongolia.

Marie Read / Purple finch (Carpodacus purpureus) male perched in flowering Eastern redbud tree, New York, USA, May

Charlie Summers / Mustang (Equus caballus) stallion rolling in a waterhole at the foot of a snowbank. Pryor Mountain Range, Montana, USA

Charlie Summers / Two Mustang (Equus caballus) Stallions stand rear to rear and kicking each other, Mountain Range, Montana, USA

Charlie Summers / Mustang (Equus ferus caballus) portrait standing in grassland at dusk, IRAM Wild Horse Sanctuary in South Dakota, USA, September

Charlie Summers / Wild Horses (Equus ferus caballus) dominance fight in high mountain meadow. Pryor Mountains of Montana, USA

Kristel Richard / A wild Misaki-uma breeding stallion bites away a bachelor stallion, in the Cape Toi Reserve, Miyazaki Prefecture, Kyushu Island, Japan.

Kristel Richard / A wild Misaki-uma breeding stallion (Equus ferus caballus) bites away a bachelor stallion, in the Cape Toi Reserve, Miyazaki Prefecture, Kyushu Island, Japan.

Kristel Richard / A wild Misaki-uma breeding stallion (Equus ferus caballus) herds his mares away, Cape Toi Reserve, Miyazaki Prefecture, Kyushu Island, Japan.

Kristel Richard / A wild Misaki-uma breeding stallion (Equus ferus caballus) watches another stallion's mares while keeping his mares behind him, in the Cape Toi Reserve, Miyazaki Prefecture, Kyushu Island, Japan.