Edwin Giesbers / Saltwater crocodile (Crocodylus porosus) close up portrait, Sarawak, Borneo, Malaysia

Michael Pitts / Saltwater crocodile underwater {Crocodylus porosus} Kakadu NP, NT, Australia

Alex Mustard / American crocodile (Crocodylus acutus) shows off its teeth. Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea.

Brandon Cole / Crocodile fish (Cymbacephalus beauforti) camouflaged, Egypt, Red Sea.

Claudio Contreras / American crocodile (Crocodylus acutus), Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba.

Jordi Chias / Crocodile icefish or White-blooded fish (Channichthyidae), Antarctic Peninsula, Antarctica.

Shane Gross / American crocodile (Crocodylus acutus) with open mouth amongst Seagrass (Alismatales). Gardens of the Queen National Park, Cuba.

Claudio Contreras / American crocodile (Crocodylus acutus), underwater, Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba, January. Vulnerable species.

Alex Mustard / American crocodile (Crocodylus acutus) reflected in the surface as it floats, Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea.

Claudio Contreras / American crocodile (Crocodylus acutus) rear view of animal swimming away over seagrass bed, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Claudio Contreras / American crocodile (Crocodylus acutus) exhaling bubbles underwater, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico, May.

Claudio Contreras / American crocodile (Crocodylus acutus) split level with animal resting at surface in shallow water over seagrass bed, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Claudio Contreras / American crocodile (Crocodylus acutus) rear view of animal resting in shallow water, close up of tail, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Claudio Contreras / American crocodile (Crocodylus acutus) resting just above seagrass underwater, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Claudio Contreras / American crocodile (Crocodylus acutus) extreme close up with jaws open, Banco Chinchorro Biosphere Reserve, Caribbean region, Mexico

Ingo Arndt / American Crocodile (Crocodylus acutus) swimming in open ocean, Pacific Coast, Ostional, Costa Rica

Konrad Wothe / Estuarine / Saltwater crocodile (Crocodylus porosus) amongst mangrove roots, Daintree National Park, Queensland, Australia, October

Edwin Giesbers / Two Saltwater crocodiles (Crocodylus porosus) with heads raised out of water, Sarawak, Borneo, Malaysia

Andy Rouse / Saltwater crocodile (Crocodylus porosus) striking, Northern Territories, Australia

Jurgen Freund / Saltwater crocodile (Crocodylus porosus) swimming underwater, New Guinea, Indo-pacific

Jurgen Freund / Saltwater crocodile (Crocodylus porosus) swimming at water surface, split-level, New Guinea, Indo-pacific

Jurgen Freund / Saltwater crocodile (Crocodylus porosus) swimming underwater, New Guinea, Indo-pacific

Jurgen Freund / Saltwater crocodile (Crocodylus porosus) swimming at surface, split-level, New Guinea, Indo-pacific

Jurgen Freund / Looking up at a Saltwater crocodile (Crocodylus porosus) swimming at water surface, New Guinea, Indo-pacific

Jurgen Freund / Saltwater crocodile (Crocodylus porosus) jumping out of water to catch dangling bait in Hartley's Creek crocodile farm, Queensland, Australia

Jurgen Freund / Foot of saltwater crocodile (Crocodylus porosus), Queensland, Australia

Michael Pitts / Saltwater crocodile hatchling on adult's head {Crocodylus porosus} NT, Australia

Ben Osborne / Saltwater crocodile returning to sea {Crocodylus porosus} Crab Is, Queensland, Australia Cape

Ben Osborne / Imprint of Saltwater crocodile on sand {Crocodylus porosus} Queensland, Australia

Jurgen Freund / Juvenile Saltwater crocodile {Crocodylus porosus} amongst Mangroves, Sulawesi, Indonesia

Angelo Gandolfi / Saltwater (Estuarine) crocodile {Crocodylus porosus} Northern Territory, Australia

Richard Kirby / Open mouthed saltwater crocodile, Northern Territories, Australia

Mike Parry / Saltwater Crocodile (Crocodylus porosus) swimming, Oro Bay, Papua New Guinea

Mike Parry / Saltwater Crocodile (Crocodylus porosus) underwater, South Australia.

Mike Parry / Saltwater Crocodile (Crocodylus porosus) juvenile, New Britain Island, Papua New Guinea

Ingo Arndt / Saltwater Crocodile (Crocodylus porosus) swimming, Northern Territory, Australia

Enrique Lopez-Tapia / Saltwater crocodile (Crocodylus porosus) in wetland, tourist photographing in foreground. Kakadu National Park, Northern Territory, Australia. 2008.

Enrique Lopez-Tapia / Saltwater crocodile (Crocodylus porosus) in swamp. Kakadu National Park, Northern Territory, Australia.

Enrique Lopez-Tapia / Saltwater crocodile (Crocodylus porosus). Kakadu National Park, Northern Territory, Australia.

Enrique Lopez-Tapia / Saltwater crocodile (Crocodylus porosus) with head above water in morning light. Kakadu National Park, Northern Territory, Australia.

Enrique Lopez-Tapia / Saltwater crocodile (Crocodylus porosus), close up of scales. Captive.

Enrique Lopez-Tapia / Saltwater crocodile (Crocodylus porosus), close up of scales. Captive.

Enrique Lopez-Tapia / Saltwater crocodile (Crocodylus porosus) in water, portrait. Captive.

Shane Gross / American crocodile (Crocodylus acutus) in seagrass bed. Jardines de la Reina / Gardens of the Queen National Park, Cuba.

Shane Gross / American crocodile (Crocodylus acutus) in seagrass bed. Jardines de la Reina / Gardens of the Queen National Park, Cuba.

Shane Gross / Crocodile fish (Cymbacephalus beauforti), ambush predator camouflaged and partially buried in sand on sea floor. Marsa Alam, Egypt.

Shane Gross / Red lionfish (Pterois volitans), two on sea floor beside Crocodile fish (Cymbacephalus beauforti), an ambush predator camouflaged and hidden. Marsa Alam, Egypt.

Alex Mustard / RF - American crocodile (Crocodylus acutus) swims through sunrays. Jardines de la Reina, Gardens of the Queen National Park, Cuba. Caribbean Sea. (This image may be licensed either as rights managed o...