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Most reptiles have a three-chamber heart consisting of two atria, one variably-partitioned ventricle, and two aorta that go the systemic circulation. The degree of mixing of oxygenated and deoxygenated blood in the three-chamber heart is variable depending on the species and physiological state. Under different conditions, deoxygenated blood can be shunted back to the body or oxygenated blood can be shunted back to the lungs. This variation in blood flow has been hypothesized to allow more effective thermoregulation and longer diving times for aquatic species, but has not been shown to be a fitness advantage.

Eyelash viper

Eyelash viper
Bothriechis schlegelii is a venomous pitviper species found in Central and South America.

Green snake

Green snake
Opheodrys vernalis, Liochlorophis vernalis are non-venomous North American snakes.

Viper camuflage

Viper camuflage
Vipers are found all over the world, except in Australia and Madagascar.

Snake

Snake
There are 2,700+ species of snakes in size from 10 cm to 9 m (30 ft) long.

Snake lovers

Snake lovers
Cobras, vipers, and closely related species use venom to immobilize or kill their prey.

Cobra

Cobra
In 2003, a new species of cobra: Naja nubiae or Nubian Spitting Cobrawas was discovered at London Zoo

Lizard

Lizard
Squamata (lizards, snakes and amphisbaenids ("worm-lizards"): approximately 7,900 species.

Gekko

Gekko
Gekko is a genus of extremely diverse. Southeast Asian geckos are known as True or Calling Geckos.

Caiman 01

Caiman 01
Crocodilia (crocodiles, gavials, caimans and alligators): 23 species.

Python reticulatus

Python reticulatus
Python reticulatus is a non-venomous python species found in Southeast Asia.

Pitviper snake

Pitviper snake
Bothrops alternatus is a venomous pitviper species found in Brazil, Paraguay, Uruguay and Argentina.

Mandarin snake

Mandarin snake
Mandarin Ratsnake Elaphe mandarina is a species of snake found in Asia.

Harlequin snake

Harlequin snake
Striped Harlequin Snake (Homoroselaps dorsalis)

Coral snake

Coral snake
Coral Snake Antivenom in the United States will be exhausted between October and December, 2008.


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