As she goes about her daily routine, she leaves an odor trail as she pushes off resistance points on the ground See Getting Around. Snakes took a different approach and extended their trachea instead. As amniotes, reptile eggs are surrounded by membranes for protection and transport, which adapt them to reproduction on dry land. Fossils date back to around million years ago and share remarkably similar characteristics. It was worshipped as one of the gods and was also used for sinister purposes: determination repriles sex in of an adversary and ritual suicide Cleopatra.