By Justus Locus


Reptiles have a backbone and are vertebrates.  Reptiles are covered in scales.  Reptiles breathe with lungs.  Most reptiles lay eggs.  Some reptiles, like the boa constrictor, give birth to live young.  Almost all reptiles are cold blooded.  Diverged from ancestral amphibians about 340 million years ago. Turtles are among the most ancient of the reptiles alive today and have changed little since they first appeared some 200 million years ago.

The environment

Reptiles are cold-blooded which means they do not generate their own internal heat.  Reptiles must rely on their environment for warmth.  They bask in the warmth of the sun during the day and seek shelter at night to avoid cold.  Reptiles also must avoid overheating, so if daytime temperatures climb too high, they must seek shelter to avoid absorbing too much heat.

The order

Crocodile which are crocodiles, gharials, caimans and alligators: 23 species.  Sphenodontia which are tuataras from New Zealand: 2 species.  Squamata which are lizards, snakes and amphisbaenids ("worm-lizards"): about 7,900 species.  Testudines which are turtles and tortoises:  300 species

The Squamata Family

The Squamata or the scaled family are the largest order of reptiles.  The most diverse of all the reptile groups and include lizards, snakes and worm-lizards.  It has over 8000 species.  The second largest order of vertebrates.  In this order they are distinguished by their skin. The male members of the group Squamata have hemipenes, which are usually held inverted within their bodies, and are everted for reproduction.

Collared Lizard

The eastern collared lizard, also called common collared lizard, or Oklahoma collared  lizard. A North American lizard that can reach 8–14 inches (20–36 cm) in length.  They are well known to run on their hind legs.  Mostly find in dry open regions of Mexico and south central United States.The collared lizard is the state retile of Oklahoma, where it is known as the mountain boomer.


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