Ingo Arndt / American Alligator (Alligator mississippiensis) split level, Everglades, USA, January.

Ingo Arndt / American alligator (Alligator mississippiensis) split level, Everglades, USA, January.

George Sanker / Alligator (Alligator mississippienis) at the surface, with clouds reflected on the water, Everglades, Florida, USA, March.

Mark MacEwen / American Alligator (Alligator mississippiensis) close up of scutes / scales, Florida Everglades, Florida, USA.

Pete Oxford / American alligator (Alligator mississippiensis) half submerged, Okefenokee National Wildlife Refuge, Florida, USA

Doug Perrine / Snout of approaching American alligator (Alligator mississippiensis) Big Cypress National Preserve, Florida Everglades, USA

Doug Perrine / American alligator (Alligator mississippiensis) with mouth open, split level, Big Cypress National Preserve, Florida Everglades, USA

Doug Perrine / American alligator (Alligator mississippiensis) mouth closed but teeth showing, split level, Big Cypress National Preserve, Florida Everglades, USA

Doug Perrine / American alligator (Alligator mississippiensis) with mouth open, split level, Big Cypress National Preserve, Florida Everglades, USA

Rolf Nussbaumer / American alligator {Alligator mississippiensis} floating at water surface, Welder Wildlife Refuge, Sinton, Texas, USA.

Doug Perrine / American alligator {Alligator mississippiensis} Florida, USA.

Rolf Nussbaumer / American alligator submerged {Alligator mississipiensis} Sanibel Is, Florida, USA.

John Cancalosi / American alligator {Alligator mississippiensis} leucistic, captive, USA

Lynn M Stone / Shoes, belts and purses made from American alligator skin / leather, Florida, USA

PETER SCOONES / American alligator underwater (alligator mississippiensis) Florida

PETER SCOONES / American alligator underwater, Silver Springs, Florida, USA. Captive animal.

PETER SCOONES / American alligator underwater (alligator mississippiensis) Silver Springs, Florida, USA captive

PETER SCOONES / American alligator underwater. Florida, USA

PETER SCOONES / American alligator underwater. Silver Springs, Florida, USA

Niall Benvie / American alligator (A. mississippiensis) teeth. C. PY, USA. Pennsylvania

Lynn M Stone / American alligator at water surface, Florida, USA (Alligator mississippiensis) captive

Lynn M Stone / American alligator portrait, Florida, USA

David Kjaer / American Alligator female carrying baby on head. Texas, USA

Daniel J. Cox / Jaguar (Panthera onca) predating Spectacled Caiman (Caiman crocodilus) in river, Pantanal, Brazil

Ingo Arndt / American Alligator (Alligator mississippiensis) in water, Everglades National Park, Florida

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

Scott Leslie / American Alligator (Alligator mississippiensis) juvenile, Florida

Luciano Candisani / Jacare Caiman (Caiman yacare) young in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) two weeks old young in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) waiting for fish to swim through open mouth in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) standing on bottom of wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) swimming away, wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) waiting for fish to swim through open mouth in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare)fishing in wetland, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) fishing in flooded plain, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) in forest, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) group in wetland at night, Pantanal, Brazil

Luciano Candisani / Jacare Caiman (Caiman yacare) baby seen from below, Brazil

Tim Fitzharris / American Alligator (Alligator mississippiensis), Everglades, Florida

Luciano Candisani / Jacare Caiman (Caiman yacare) with open mouth, Pantanal, Brazil

Heidi & Hans-Juergen Koch / American Alligator (Alligator mississippiensis) three large adults laying in shallow water, Florida

Konrad Wothe / Spectacled Caiman (Caiman crocodilus) with orange butterfly perched on tip of snout, Pantanal, Mato Grosso, Brazil

Tim Fitzharris / American Alligator (Alligator mississippiensis), North America

Jim Brandenburg / American Alligator (Alligator mississippiensis) floating at water surface, Everglades National Park, Florida

MYN / Paul Marcellini / Sequence of an American alligator (Alligator mississippiensis) hatching from its egg, Palmdale, Florida, USA. Digital composite.

Mark Bowler / Alligator snapping turtle (Macrochelys temminckii) captive

Philippe Clement / American sweetgum (Liquidambar styraciflua) close up of immature fruit, October

Jeff Foott / Black vulture (Coragyps atratus) feeding on dead Yacare Caiman (Caiman yacare) Cuiaba River, Pantanal Matogrossense National Park, Pantanal, Brazil.