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

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

Tui De Roy / Galapagos sea lion (Zalophus wollebaeki) killing tuna. A group of the sea lion bulls have learnt to herd Pelagic yellowfin tuna into a small cove, trapping them. The fish often leap ashore in an effor...

Graeme Guy/ BIA / African Lion (Panthera leo) female suffocating Blue Wildebeest (Connochaetes taurinus) prey, Masai Mara, Kenya

Frederique Olivier / Group of Adelie penguins (Pygoscelis adeliae) destroying an egg with a chick inside, Adelie Land, Antarctica, January.

Luciano Candisani / Green Anaconda (Eunectes murinus) female constricting male after copulation, after which she will consume him, Brazil

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

Denis-Huot / Olive baboon (Papio anubis) males fighting over newborn Thomson's gazelle (Eudorcas thomsonii) prey, Masai-Mara game reserve, Kenya.

Andy Rouse / Cheetah (Acinonyx jubatus) catching gazelle, Maasai Mara, Kenya, Africa

Denis-Huot,Denis-Huot / Lion (Panthera leo) male playing with a newborn topi before killing it (Damaliscus korrigum) Masai-Mara Game Reserve, Kenya. Vulnerable species.

Denis-Huot / Spotted hyena (Crocuta crocuta) killing a newborn Grant's gazelle (Nanger granti) Masai-Mara game reserve, Kenya

Andrew Parkinson / Sparrowhawk (Accipiter nisus) adult killing and plucking feathers from collared dove. Derbyshire, UK, November. British Wildlife Photographer of the Year (BWPA) competition 2012, 'Animal Behaviour' ca...