Chacma Baboon (Papio ursinus) baring its teeth to show aggression, Kruger National Park, South Africa, Africa

Spotted hyena (spotted hyaena) (Crocuta crocuta), Masai Mara National Reserve, Kenya, East Africa, Africa

Fierce dog baring teeth

Woman in costume dancing at Mardi Gras, Carnival, Port of Spain, Trinidad and Tobago, Caribbean

Siberian tiger baring its teeth, Panthera tigris altaica

Leopard (Panthera pardus) behind a rock, hissing, Tshukudu Game Lodge, Hoedspruit, Greater Kruger National Park, Limpopo Province, South Africa

Mackenzie Wolf, Eastern wolf, Canadian wolf (Canis lupus occidentalis) in the snow, omega wolf not accepting lower rank, baring teeth, aggressive

Tiger (Panthera tigris), snarling with anger, Ranthambore National Park, Rajasthan, India, Asia

Individual from the Gneckbisser masked group during the carnival procession, Littau, Lucerne, Switzerland, Europe

Mackenzie Valley Wolves or Canadian Timber Wolves (Canis lupus occidentalis) fighting to determine hierarchy with threatening gestures

Mackenzie Valley, Canadian - or Alaskan Timber Wolves (Canis lupus occidentalis) playing, fighting at a zoo in Germany, Europe

Gelada (Theropithecus gelada), male showing his teeth, captive, Switzerland, Europe

Leopard (Panthera pardus) behind a rock, hissing, Tshukudu Game Lodge, Hoedspruit, Greater Kruger National Park, Limpopo Province, South Africa

Mackenzie Valley Wolf, Rocky Mountain Wolf, Alaskan - or Canadian Timber Wolf (Canis lupus occidentalis) baring its teeth in a forest, falling snow

Portrait of a hissing leopard (Panthera pardus), Tshukudu Game Lodge, Hoedspruit, Greater Kruger National Park, Limpopo Province, South Africa

Grey Wolf (Canis Lupus) Showing Submission Behaviour, Montebello, Quebec, Canada

Hawaii, galapagos shark (Carcharhinus galapagensis) baring teeth at surface.

Hawaii, galapagos shark (Carcharhinus galapagensis) baring teeth at surface.