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