Juergen & Christine Sohns / African Wild Dog (Lycaon pictus) group attacking Cape Warthog (Phacochoerus aethiopicus), Tswalu Game Reserve, South Africa

Jordi Chias / Chinstrap penguin (Pygoscelis antarcticus) carcass after leopard seal attack, Antarctic Peninsula, Antarctica.

Marie Read / Canada geese (Branta canadensis) two during territorial fight in early spring, Ithaca. New York, USA

Marie Read / American avocets (Recurvirostra americana) two during aggressive (territorial) encounter, Bear River Migratory Bird Refuge, Utah, USA, May.

Daniel J. Cox / Gray Wolf (Canis lupus) killing female Elk (Cervus elaphus) crossing river, Alum Creek, Yellowstone National Park, Wyoming, sequence 3 of 4

Daniel J. Cox / Gray Wolf (Canis lupus) attacking female Elk (Cervus elaphus) crossing river, Alum Creek, Yellowstone National Park, Wyoming, sequence 2 of 4

Daniel J. Cox / Gray Wolf (Canis lupus) pair predating female Elk (Cervus elaphus) crossing river, Alum Creek, Yellowstone National Park, Wyoming, sequence 1 of 4

Paul Bertner / Assassin Bug (Acanthaspis sp) being attacked by ants, Gunung Leuser National Park, Sumatra, Indonesia

Neil Aldridge / White rhinoceros (Ceratotherium simum) female 'Thandi' silhouetted against the sunset, Kariega Game Reserve. South Africa. Thandi's horns were taken in a brutal attack by poachers.

Alan Murphy / Sharp-shinned Hawk (Accipiter striatus) attacking bird in flight, Texas

Nick Garbutt / Female Capybara (Hydrochoerus hydrochaeris) swimming in line with young after escaping a Jaguar attack (Panthera onca palustris) in a lagoon off the Paraguay River. Taiama Ecological Reserve, Pantanal...

Anup Shah / Cheetah (Acinonyx jubatus) chasing Impala (Aepyceros melampus) female, Masai Mara, Kenya