A Spotted Moray Eel (Gymnothorax moringa) displays an open mouth as it protrudes it's head just outside a hole in a coral reef in the Atlantic Ocean off the coast of Key Largo, Florida.

Gold-speck jawfish mouth wide open, Lembeh Strait, Bitung, North Sulawesi, Indonesia.

Hippopotamus Amphibius (Hippo), open jaw used as warning by males protecting females, plentiful in the Luangwa River, Zambia, Africa

Indian Gharial, Chitwan National Park, Nepal

Basking Shark (Cetorhinus maximus) Close up of head. Cornwall, UK. (A4 only).

Yacare Caiman (Caiman yacare, Caiman crocodilus yacara), Pantanal, Mato Grosso do Sul, Brazil, South America

Spectacled caiman (Caiman crocodilus yacare), open mouth with leeches, animal portrait, Pantanal, Mato Grosso, Brazil, South America

Nile crocodile (Crocodylus niloticus) with a captured catfish, Chobe River, Chobe National Park, Botswana, Africa

Museum near Moose Jaw, Saskatchewan, Canada

Close-up of Nile crocodile (Crocodylus niloticus) with open jaws, Grumeti Serengeti Tented Camp, Serengeti National Park; Tanzania

Hawaii, This galapagos shark (Carcharhinus galapagensis) can reach twelve feet in length and is listed as potentially dangerous. It has been attracted with bait and has broken the surface with a splash.

Caribbean, Bonaire, Great Barracuda (Sphyraena Barracuda).

Mexico, Guadalupe Island, Great White Shark (Carcharodon carcharias) biting down on bait above ocean surface.

Mexico, Guadalupe Island, Great white Shark (Carcharodon carcharias) facing steel cage.

Micronesia, Yap, Yellow juvenile jacks swim with a grey reef shark, (Carcharhinus amblyrhynchos).

Caribbean, Bonaire, Great Barracuda (Sphyraena Barracuda).

Mexico, Guadalupe Island, Great White Shark (Carcharodon carcharias) near safety steel cage.