Yukihiro Fukuda / Feral domestic rabbit (Oryctolagus cuniculus) standing on hind legs on coast, Okunojima Island, also known as Rabbit Island, Hiroshima, Japan.

Nick Upton / Feral horse (Equus caballus) walking on a remote sandy beach, near Arta, Mallorca, Spain, August.

Steven David Miller / Long-nosed potoroo (Potorous tridactylus) feeding on bird seed fallen from bird feeders which encourages them to come out into open woodland. Fences around the property protect them from feral predato...

Cyril Ruoso / Feral Horses (Equus caballus) gathering around waterhole, Namib-Naukluft National Park, Namibia.

Carol Walker / Two wild pinto Mustang stallions battle for dominance in Sand Wash Basin, Colorado, USA.

Carol Walker / Two wild Mustang stallions fighting in the White Mountain Herd Area, Wyoming, USA. August.

Anup Shah / Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) female grooming a domestic dog. Jodhpur, Rajasthan, India. March.

Fiona Rogers / Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) female grooming a domestic dog. Jodhpur, Rajasthan, India. March.

Yukihiro Fukuda / Feral domestic rabbit (Oryctolagus cuniculus) running in puddle, Okunojima Island, also known as Rabbit Island, Hiroshima, Japan.

Michel Poinsignon,Michel Poinsignon / Merens horse (Equus caballus) mare with resting foal, Pyrenees mountains, France, August.

Gerry Ellis / Black-faced Vervet Monkey (Cercopithecus aethiops) pair playing on camera and tripod, Barbados, Caribbean, native to East and southern Africa

Mitsuaki Iwago / European Rabbit (Oryctolagus cuniculus) group along Dingo fence, once introduced for hunting now are considered a pest, Australia