Reptiles have been around for 300 million years, even during the dinosaur age. Reptiles are members of a class of air-breathing, ectothermic (cold-blooded) vertebrates which are characterized by laying shelled eggs and having skin covered in scales and/or scutes. Lepidosaurs (lizards, snakes, tuataras), and archosaurs (crocodilians, dinosaurs, and birds).
Biggest lizard - the Komodo dragon (up to 3 m long)
Biggest turtle - the leatherback turtle (up to 2.5 m)
Biggest (Most Massive) reptile - the estuarine crocodile (over 7 m long).
Biggest (heaviest) snake - the anaconda of South America.
Only poisonous lizards - the Gila monster, the beaded lizard
Fastest-moving snake - probably the poisonous black mamba
Turtles and Tortoises