They have well developed kidneys and lungs, and excrete uric acid. They have a full digestive system and have an internal bone structure. They have chemoreceptors, vibration senses, heat senses, eyes and a sense organ called Jacobson's organ that tells the reptile about its surroundings. Reptiles are ectothermic. They have an amniotic egg with a leathery shell protecting it, a yolk with nourishment for the embryo, a chorian for gas exchange and an allentois for waste removal.
Turtles have a two part shell, with the vertebrae and rib fused to it.
Dinosaurs were a member of class reptilia. Class aves are the birds. They have claws and scales on their feet, and also have an amniotic egg, with a brittle shell, that is incubated in a nest. They have modified scales on the rest of their body called feathers, which are lightweight and provide insulation and flight. They have modified front appendages called wings, which also helps them fly, with help from strong muscles attached to a large sternum.