Edwin Giesbers / Barbary macaque (Macaca sylvanus) baring teeth as a sign of submission, Gibraltar Nature Reserve, Gibraltar,

Espen Bergersen / Bengal tiger (Panthera tigris) baring teeth, Bandhavgarh, India.

Mark MacEwen / Lioness (Panthera leo) feeding on carcass, Ngorongoro Crater, Tanzania, Africa.

Chris & Monique Fallows / Great white shark (Carcharodon carcharias) breaching whilst attacking seal decoy, Seal Island, False Bay South Africa.

Denis-Huot,Denis-Huot / Lions (Panthera leo) mating, Masai-Mara Game Reserve, Kenya

Alex Mustard,Alex Mustard / Wolf fish (Anarhichas lupus) face portrait. Gardur, south west Iceland. North Atlantic Ocean.

Mark MacEwen / Broad snouted caiman (Caiman latirostris) baby carried in mother's mouth from the nest, Sante Fe, Argentina, February

Franco Banfi,Franco Banfi / Spectacled caiman (Caiman crocodilus) Rio Baia Bonita, Bonito, Mato Grosso do Sul, Brazil

Denis-Huot,Denis-Huot / Lion (Panthera leo) mating, Masai-Mara Game Reserve, Kenya. Vulnerable species.

Steven Kazlowski / Polar bear {Ursus maritimus} baring teeth at truck window, seen from inside vehicle, Coastal plain of the Arctic National Wildlife Refuge, Alaska.

Anup Shah / Hamadryas baboon male threat display {Papio hamadryas} baring teeth

Andy Rouse / Bengal tiger (Panthera tigris) sub-adult male snarling. Ranthambhore National Park, India.