Pete Oxford / American Crocodile (Crocodylus acutus) nest excavated by nesting female Green Iguana (Iguana iguana), Banco Chinchorro, Yucatan Peninsula, Mexico

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

Jim Brandenburg / Nile Crocodile (Crocodylus niloticus) thermoregulating, Caprivi Strip, Namibia

Jim Brandenburg / Nile Crocodile (Crocodylus niloticus) mouth defense displaying, South Africa

Jim Brandenburg / Nile Crocodile (Crocodylus niloticus) thermoregulating, Caprivi Strip, Namibia

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

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

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

Mitsuaki Iwago / Freshwater Crocodile (Crocodylus johnstoni) with an open mouth, Australia

Chien Lee / Saltwater Crocodile (Crocodylus porosus), Kinabatangan Wildlife Sanctuary, Sabah, Malaysia

Richard Du Toit / Crocodile warning sign, iSimangaliso Wetland Park, KwaZulu-Natal, South Africa

Richard Du Toit / Crocodile warning sign, iSimangaliso Wetland Park, KwaZulu-Natal, South Africa

Anup Shah / Nile Crocodile (Crocodylus niloticus) attacking Blue Wildebeest (Connochaetes taurinus) during river crossing, Mara River, Masai Mara, Kenya

Konrad Wothe / Leopard (Panthera pardus) and returning Nile Crocodile (Crocodylus niloticus) competing over Zebra (Equus quagga) prey, foal has rejoined family, Mara River, Masai Mara, Kenya. Sequence 9 of 10

Konrad Wothe / Leopard (Panthera pardus) and returning Nile Crocodile (Crocodylus niloticus) competing over Zebra (Equus quagga) prey, foal has rejoined family, Mara River, Masai Mara, Kenya. Sequence 8 of 10

Konrad Wothe / Zebra (Equus quagga) mother evading Nile Crocodile (Crocodylus niloticus), Mara River, Masai Mara, Kenya. Sequence 4 of 10

Theo Allofs / Nile Crocodile (Crocodylus niloticus) carrying Burchell's Zebra (Equus burchellii) prey, Mara River, Masai Mara, Kenya

Theo Allofs / Nile Crocodile (Crocodylus niloticus) pair fighting, Mara River, Masai Mara, Kenya

Pete Oxford / American Crocodile (Crocodylus acutus) nest excavated by nesting female Green Iguana (Iguana iguana), Banco Chinchorro, Yucatan Peninsula, Mexico

Pete Oxford / American Crocodile (Crocodylus acutus), Banco Chinchorro, Yucatan Peninsula, Mexico

Pete Oxford / American Crocodile (Crocodylus acutus), Banco Chinchorro, Yucatan Peninsula, Mexico

Pete Oxford / American Crocodile (Crocodylus acutus), Banco Chinchorro, Yucatan Peninsula, Mexico

Pete Oxford / American Crocodile (Crocodylus acutus), Banco Chinchorro, Yucatan Peninsula, Mexico

Pete Oxford / American Crocodile (Crocodylus acutus), Banco Chinchorro, Yucatan Peninsula, Mexico

Pete Oxford / American Crocodile (Crocodylus acutus), Banco Chinchorro, Yucatan Peninsula, Mexico

Pete Oxford / American Crocodile (Crocodylus acutus) in wetland, Banco Chinchorro, Yucatan Peninsula, Mexico

Scott Leslie / American Crocodile (Crocodylus acutus) thermoregulating, Everglades National Park, Florida

Scott Leslie / American Crocodile (Crocodylus acutus),sunning, Everglades National Park, Florida

Thomas Marent / Mugger Crocodile (Crocodylus palustris), Cauvery Wildlife Sanctuary, India

Anup Shah / Nile Crocodile (Crocodylus niloticus) group feeding on Hippopotamus (Hippopotamus amphibius) carcass, Masai Mara, Kenya

Winfried Wisniewski / Nile Crocodile (Crocodylus niloticus), Chobe River, Chobe National Park, Botswana

Winfried Wisniewski / Nile Crocodile (Crocodylus niloticus) swimming, Chobe River, Chobe National Park, Botswana

Cyril Ruoso / Saltwater Crocodile (Crocodylus porosus) front view with mouth open, Northern Territory, Australia

Cyril Ruoso / Saltwater Crocodile (Crocodylus porosus) close-up profile, Northern Territory, Australia

Cyril Ruoso / Saltwater Crocodile (Crocodylus porosus) at waters edge with open mouth, Northern Territory, Australia

Cyril Ruoso / Saltwater Crocodile (Crocodylus porosus) at waters edge with open mouth, Northern Territory, Australia

Cyril Ruoso / Saltwater Crocodile (Crocodylus porosus) close-up of head, showing interior of mouth, Northern Territory, Australia

Cyril Ruoso / Saltwater Crocodile (Crocodylus porosus) crouching in grass, Northern Territory, Australia

Cyril Ruoso / Saltwater Crocodile (Crocodylus porosus) close-up profile, Northern Territory, Australia

Cyril Ruoso / Saltwater Crocodile (Crocodylus porosus) in water, Northern Territory, Australia

Cyril Ruoso / Saltwater Crocodile (Crocodylus porosus) portrait underwater, Northern Territory, Australia

Cyril Ruoso / Saltwater Crocodile (Crocodylus porosus) close-up profile, Northern Territory, Australia

Cyril Ruoso / Saltwater Crocodile (Crocodylus porosus) farm, Darwin, Northern Territory, Australia

Cyril Ruoso / Saltwater Crocodile (Crocodylus porosus) warning sign, Northern Territory, Australia

Cyril Ruoso / Saltwater Crocodile (Crocodylus porosus) road sign warning drivers of their possible presence, Northern Territory, Australia

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

Konrad Wothe / Nile Crocodile (Crocodylus niloticus) basking in sand, Madagascar

ZSSD / Freshwater Crocodile (Crocodylus johnstoni) swimming, native to Australia

Martin Willis / Saltwater Crocodile (Crocodylus porosus) eating a fish, King Ash Bay, Northern Territory, Australia

Richard Du Toit / Nile Crocodile (Crocodylus niloticus) and fish, Mpumalanga, South Africa

Richard Du Toit / Nile Crocodile (Crocodylus niloticus) floating on water surface, Mpumalanga, South Africa

Hiroya Minakuchi / American Crocodile (Crocodylus acutus) on riverbank, Costa Rica

Michael & Patricia Fogden / American Crocodile (Crocodylus acutus) pair basking, Tarcoles River, Costa Rica

Matthias Breiter / Nile Crocodile (Crocodylus niloticus) group basking, Rhino and Lion Nature Reserve, South Africa

Christian Ziegler / American Crocodile (Crocodylus acutus) female digging up buried eggs after her babies start to hatch, Barro Colorado Island, Panama

Richard Du Toit / Nile Crocodile (Crocodylus niloticus), Kruger National Park, South Africa

Ingo Arndt / Saltwater Crocodile (Crocodylus porosus) jumping out of water, Northern Territory, Australia

Ingo Arndt / Saltwater Crocodile (Crocodylus porosus) jumping out of water, Northern Territory, Australia

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

Ingo Arndt / Saltwater Crocodile (Crocodylus porosus) jumping out of water, Northern Territory, Australia

Pete Oxford / Cuban Crocodile (Crocodylus rhombifer) thermoregulating near Zapata Swamp National Park, Cuba

Pete Oxford / Cuban Crocodile (Crocodylus rhombifer) near Zapata Swamp National Park, Cuba

Pete Oxford / Cuban Crocodile (Crocodylus rhombifer) group in farm near Zapata Swamp National Park, Cuba

Pete Oxford / Cuban Crocodile (Crocodylus rhombifer) near Zapata Swamp National Park, Cuba

Pete Oxford / Cuban Crocodile (Crocodylus rhombifer) thermoregulating near Zapata Swamp National Park, Cuba

Pete Oxford / American Crocodile (Crocodylus acutus) in shallow water, Jardines de la Reina National Park, Cuba

Pete Oxford / American Crocodile (Crocodylus acutus) in shallow water, Jardines de la Reina National Park, Cuba

Pete Oxford / Morelet's Crocodile (Crocodylus moreletii) displaying, Coba, Quintana Roo, Mexico

Pete Oxford / Morelet's Crocodile (Crocodylus moreletii) at surface, Coba, Quintana Roo, Mexico

Chien Lee / New Guinea Crocodile (Crocodylus novaeguineae) juvenile in defensive posture, Wasur National Park, Indonesia

Chien Lee / Mugger Crocodile (Crocodylus palustris) walking on shore, Yala National Park, Sri Lanka

Konrad Wothe / Saltwater Crocodile (Crocodylus porosus) on mudbank in mangroves, Daintree National Park, Queensland, Australia

Konrad Wothe / Saltwater Crocodile (Crocodylus porosus) on mudbank in mangroves, Daintree National Park, Queensland, Australia

Konrad Wothe / Saltwater Crocodile (Crocodylus porosus) in mangroves, Daintree National Park, Queensland, Australia

Pete Oxford / Orinoco Crocodile (Crocodylus intermedius) female used for captive breeding program, Hato Masaguaral working farm and biological station, Venezuela

Pete Oxford / Orinoco Crocodile (Crocodylus intermedius) female used for captive breeding program, Hato Masaguaral working farm and biological station, Venezuela

Pete Oxford / Orinoco Crocodile (Crocodylus intermedius) juvenile for release into the wild, Hato Masaguaral working farm and biological station, Venezuela

Pete Oxford / Orinoco Crocodile (Crocodylus intermedius) female used for captive breeding program, Hato Masaguaral working farm and biological station, Venezuela

Pete Oxford / Orinoco Crocodile (Crocodylus intermedius) female used for captive breeding program, Hato Masaguaral working farm and biological station, Venezuela

Pete Oxford / Orinoco Crocodile (Crocodylus intermedius) male used for captive breeding program, Hato Masaguaral working farm and biological station, Venezuela

Pete Oxford / Orinoco Crocodile (Crocodylus intermedius) female used for captive breeding program, Hato Masaguaral working farm and biological station, Venezuela

Pete Oxford / Orinoco Crocodile (Crocodylus intermedius) female used for captive breeding program, Hato Masaguaral working farm and biological station, Venezuela

Pete Oxford / Orinoco Crocodile (Crocodylus intermedius) female used for captive breeding program, Hato Masaguaral working farm and biological station, Venezuela

Pete Oxford / Orinoco Crocodile (Crocodylus intermedius) juvenile, part of reintroducing into the wild program, Puerto Ayacucho, Venezuela

Pete Oxford / Orinoco Crocodile (Crocodylus intermedius) juvenile, part of reintroducing into the wild program, Puerto Ayacucho, Venezuela

Suzi Eszterhas / African Wild Dog (Lycaon pictus) group watching crocodiles in river, northern Botswana

Sergey Gorshkov / Nile Crocodile (Crocodylus niloticus) female near nest, Botswana

Kevin Schafer / Mugger Crocodile (Crocodylus palustris) entering water, National Chambal Sanctuary, Madhya Pradesh, India

Kevin Schafer / Mugger Crocodile (Crocodylus palustris) on shore, National Chambal Sanctuary, Madhya Pradesh, India

Steven David Miller / Saltwater crocodile (Crocodylus porosus) at surface in water, Edward River Croc farm, Cairns, Queensland, Australia

Kevin Schafer / Morelet's Crocodile (Crocodylus moreletii) emerging from water, Calakmul Biosphere Reserve, Mexico

Kevin Schafer / Morelet's Crocodile (Crocodylus moreletii) tail scales, Calakmul Biosphere Reserve, Mexico

Mike Parry / Saltwater Crocodile (Crocodylus porosus) at surface, Huon Gulf, Papua New Guinea

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

Vincent Grafhorst / Nile Crocodile (Crocodylus niloticus) half submerged, Antananarivo Crocodile Farm, Antananarivo, Madagascar

Vincent Grafhorst / Nile Crocodile (Crocodylus niloticus) sunbathing on top of others, Antananarivo Crocodile Farm, Antananarivo, Madagascar