Fabio Pupin / Onager (Equus hemionus), Negev desert, Israel, April.

Eric Dragesco / Small herd of Asiatic Wild Ass (Equus hemionus) running, Gobi National Park, Mongolia

Eric Dragesco / Three Asiatic Wild Ass (Equus hemionus) running, Gobi National Park, Mongolia

Eric Dragesco / Asiatic Wild Ass (Equus hemionus) portrait, standing against blue sky, Gobi National Park, Mongolia

Eric Dragesco / Three Asiatic Wild Ass (Equus hemionus) running, Gobi National Park, Mongolia

Eric Dragesco / Small herd of Asiatic Wild Ass (Equus hemionus) running, Gobi National Park, Mongolia

Bernard Castelein / Khur / Asiatic wild ass (Equus hemionus) with foal, walking at sunset, Little Rann of Kutch, Gujarat, India

Bernard Castelein / Khur / Asiatic wild ass (Equus hemionus) with foal, Little Rann of Kutch, Gujarat, India

Ernie Janes / Asiatic wild ass (Equus hemionus) with foal, captive, UK, endangered species

Anup Shah / Indian wild ass racing across landscape {Equus hemionus khur} Little Rann of Kutch

Anup Shah / Khur (Indian ass) with young {Equus hemionus khur} Rann of Kutch, Gujarat, India

Xi Zhinong / Asiatic wild ass herd {Equus hemionus} Arjinshan Nature Reserve Xinjiang province, China