Doug Perrine / Morelet's / Mexican crocodile (Crocodylus moreletii) at surface of cenote (freshwater spring). Near Tulum, Yucatan Peninsula, Mexico. Endangered

Edwin Giesbers / Nile crocodile {Crocodylus niloticus} close-up of skin, captive

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

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

Denis-Huot / Nile crocodile (Crocodylus niloticus) feeding on Thomson's gazelle (Eudorcas thomsonii) Mara river, Masai-Mara game reserve, Kenya.

Anup Shah / Nile crocodile (Crocodylus niloticus) emerging from the river, Masai Mara National Reserve, Kenya. February

Edwin Giesbers / Saltwater crocodile (Crocodylus porosus) with head raised out of water, Sarawak, Borneo, Malaysia

Doug Perrine / Morelet's / Mexican crocodile {Crocodylus moreletii} in cenote (freshwater spring) near Tulum, Yucatan Peninsula, Mexico. Endangered

Doug Perrine / Diver and Morelet's / Mexican crocodile {Crocodylus moreletii} in cenote (freshwater spring) near Tulum, Yucatan Peninsula, Mexico. Model released. Endangered

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

Edwin Giesbers / Nile crocodile (Crocodylus niloticus) partially submerged, captive, Madagascar

Jeff Rotman / Saltwater crocodile {Crocodylus porosus} leaping out of water for bait, Adelaide river, NT, Australia