1. History Turtles: the oldest living reptiles and have gone particularly unchanged in 200 million years. Turtles are considered to be the more intelligent of the reptiles. Lizards: make up the largest group of reptiles numbering @ 3,000 worldwide.

2. History cont’d Snakes:

4. Unique Characteristics of Reptiles  indeterminate growth  scales cover the entire body  snakes shed their shin in one piece  when snakes shed their skin they “hide” from predators  legs- well developed-land travel  the characteristic that makes snakes unique is their loss of limbs  respiration-lungs-air breathing  eggs-calcareous-waterproof-laid on land  some snakes give birth to live young, examples are water snakes, garter snakes, ribbon snakes, pit vipers, etc… just to name a few  mating-on land mostly  female internal fertilization of the eggs  no larval stage-no transformation  Cold blooded

6. http://health.stateuniversity.com/article_images/gem_01_img0108.jpg

8. http://www.animalpicturesarchive.com/ArchOLD/1086408038.jpg

9. http://www.tpwd.state.tx.us/kids/wild_things/images/snake_timber_rattlesnake400.jpg

10. http://niahd.wm.edu/attachments/20151.jpg

11. http://farm1.static.flickr.com/238/452663563_d306364789.jpg

13. Medical importance The most common is the snake venom used as anti-venom http://www.worldbook.com/wb/Students?content_spotlight/reptiles/type_snake_imp In ancient Greece snakes were seen as healers

15. Snake rattle http://www.youtube.com/watch?v=7raYkYyB1wo Snake hiss http://www.youtube.com/watch?v=Er6R66bxaiE&feature=related http://www.youtube.com/watch?v=Er6R66bxaiE&feature=related Timber rattlesnake: http://www.youtube.com/watch?v=DQ3RIX9Bk28