Medium close up of a rattlesnake threatening to strike in a desert in Arizona, rattling the tip of its tail and moving away from camera.

Medium close up of two green female iguanas resting on a branch in an enclosure. One iguana turns its head to look at camera.

Close up shot of a green iguana's head. It turns an eye to look at camera.

Alligator eating on water's surface, it lifts its head up from water to chew food and swims away. Water is covered in green moss.

Side view of an alligator looking towards water.

Medium close up of a rattlesnake coiled on dry ground in the threat position, rattling the tip of its tail.

Tracking shot of rattlesnake slithering rapidly towards camera on rocks and sand.

Medium close up of a camouflaged rattlesnake striking at unseen prey in Arizona.

Medium close up of an alligator head on top of water with green moss gathered on its snout. It lies completely still in water and stares straight into the camera.

Lots of alligators lounging on shore in sunshine. One alligator gets up and walks towards water.

Medium close up of an alligator walking by other alligators. It stops and rests its head on lush green grass.

India: Various shots of Mugger Crocodile basking in the sun including close up shots of snout and teeth, eyes and horny back.

East Africa. A Graceful chameleon, coloured green to match its surroundings, creeps steadily up behind a winged termite and catches it with a flash of its tongue before chewing and eating it.

Close up of an iguana's claw on a wooden post with its green leg and body in background. Nails dig into post.

Medium close up of iguana lounging on a branch with head partly in shade.

UK: Mid shot of a pair of Sand Lizards crawling along in heath land surrounded by Heather plants.

Raine Island, Australia: Wide view of hundreds of Raine Island green sea turtles on sandy beach slowly making their way to the sea.

Guapiles, Costa Rica: Close up shots of an Iguana standing in long grass in a Costa Rican rainforest.

Close up shot of two giant Galapagos tortoises eating leaves off the ground, close up of scaley tortoise leg as it walks, tortoise slowly walking toward camera.

Northern Territory, Australia: General views of a crocodile walking around on a muddy riverbank and eating something found in the mud.

A moss-covered alligator snuggles its head on another alligator's back as they float on water.

Close up of an alligator resting its head on another alligator's tail. It has dried green moss all over its head.

Galapagos Islands: Various close shots of Giant Galapagos Tortoises munching on food in a reserve

Raine Island, Australia: Various shots of baby green sea turtles hatching and climbing out from under the sand, wide view of tutles speedily scampering along the sand towards the sea.

An alligator launches itself to catch food as it's thrown into their pond. Another alligator crawls with its mouth open to be next to the eating alligator. Both alligators have green moss gathered on their snouts and backs. Other alligators loom in the green water in the background.

Small black sea turtles crawling on beach towards the sea.

Slow motion shot of a crocodile lunging out of the water on the Nile riverbank and snapping at the surrounding wildebeests. The wildebeests then stampede up the bank, away from the crocodile.