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

Bence Mate / Great egrets (Ardea alba) fighting with necks intertwined, Lake Csaj, Kiskunsagi National Park, Hungary. January.

Bence Mate / DUPLICATE Cuckoos (Cuculus canorus) squabbling, Kiskunsagi National Park, Pusztaszer, Hungary. February.

Bence Mate / Montezuma oropendola (Psarocolius montezuma) two interacting, Costa Rica.

Bence Mate / Great egrets (Ardea alba) sky pointing, sizing each other up before fighting, Lake Csaj, Kiskunsagi National Park, Pusztaszer, Hungary. January.

Staffan Widstrand / African lion, (Panthera leo) confronted by a herd of African buffalo / Cape buffalo (Syncerus caffer), Zimanga Private Nature Reserve, KwaZulu Natal, South Africa

Staffan Widstrand / African lion (Panthera leo) female confronted by a herd of African buffalo / Cape buffalo (Syncerus caffer), Zimanga Private Nature Reserve, KwaZulu Natal, South Africa.

Erlend Haarberg / Wild Reindeer (Rangifer tarandus) two males sizing one another up during rut, Forollhogna National Park. Norway.

Hanne & Jens Eriksen / Blue cheeked bee eater (Merops persicus) two squabbling, Oman, April

Sam Hobson / Peregrine falcon (Falco peregrinus). male attacking Lesser black-backed gull (Larus fuscus) Bristol, UK. June

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

Anup Shah / Cape buffalo (Syncerus caffer) chasing off Lioness (Panthera leo) Maasai Mara National Reserve, Kenya.