Mark MacEwen / Broad snouted caiman (Caiman latirostris) baby in mothers mouth being carried from nest, Sante Fe, Argentina, February

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

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.

David Pattyn / Spectacled caiman (Caiman crocodilus) portrait with head just on water surface, Pantanal, Brazil

Mark MacEwen / Broad snouted caiman (Caiman latirostris) hatching from egg in nest, Sante Fe, Argentina, February

David Pattyn / Spectacled caiman (Caiman yacare) walking on a sandy shore at the edge of a river at night, Pantanal, Brazil

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

Luiz Claudio Marigo / Jaguar (Panthera onca palustris) dragging a Yacare Caiman (Caiman yacare) onto the bank of the Piquiri River. The Pantanal wetlands of Mato Grosso State, Brazil, October.

Luiz Claudio Marigo / Jaguar (Panthera onca palustris) struggling with a Yacare Caiman (Caiman yacare) in the Piquiri River. The Pantanal wetlands of Mato Grosso State, Brazil, October. Sequence 2/4

Luiz Claudio Marigo / Jaguar (Panthera onca palustris) in water with Yacare Caiman (Caiman yacare), its teeth around the back of the prey's neck. Piquiri River, The Pantanal wetlands of Mato Grosso State, Brazil, October....

Pete Oxford / Black caiman (Melanosuchus niger) catching prey beside fisherman in boat at night, rainforest, Rupununi, Guyana, Endangered

Mark Carwardine / Dwarf caiman (Paleosuchus palpebrosus) juvenile, close-up of eye, captive, from South America

Bence Mate / Jacare / Yacare caiman (Caiman crocodilus yacare) with young armadillo prey ib its jaws. Pantanal, Brazil. WINNER: Eric Hosking Award portfolio image 3/6 - Wildlife Photographer of the Year 2010

Bence Mate / Head portrait of young Spectacled caiman (Caiman crocodilus) with mouth open, and plant sapling, Santa Rita, Costa Rica

Bence Mate / Head portrait of young Spectacled caiman (Caiman crocodilus) with jaw closed, Santa Rita, Costa Rica

Bence Mate / Head portrait of young Spectacled caiman (Caiman crocodilus) partially submerged in water, with reflection, Santa Rita, Costa Rica

Michel Roggo / Spectacled caiman (Caiman crocodylus) at water surface. Beni, Bolivia, October.

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

Edwin Giesbers / Spectacled Caiman {Caiman crocodilus} head above water, Costa Rica

Peter Scoones / Spectacled caiman underwater reflections (Caiman crocodilus) Pantanal, Brazil photographed during making of BBC Planet Earth series 2005

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.

Pete Oxford / Jacare caiman bellowing {Caiman crocodilus yacare} subsonic boom causes water to vibrate. Pantanal, Brazil

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

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

Lynn M Stone / Chinese alligator {Alligator sinensis}

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

George Sanker / American alligator (Alligator mississippiensis) submerged in river. Everglades National Park, Florida, USA. March.

Doug Wechsler / Black vulture (Coragyps atratus) eating roadkill alligator, Everglades national park, Florida. March.

Chris Mattison / Alligator (Alligator mississippiensis) in swamp vegetation, Corkscrew Swamp, Florida, USA

Steven David Miller / American Alligator (Alligator mississippiensis) basking, Corkscrew Swamp Sanctuary, Southwest Florida, USA. February.

Lynn M. Stone / American alligator (Alligator mississippiensis) in Upper Myakka Lake at sunrise. Sarasota, Florida, USA. June.

John Cancalosi / American aligator (Alligator mississippiensis), close up of skin, Louisiana, USA. November.

Heather Angel / Chinese alligator (Alligator sinensis) swimming in Yangtze, streamline with legs pressed against body. Critically endangered species with captive breeding programme in Anhui Province, China. 2009