OK, I am mulling freestyle. I can relate to amphibians a bit more than reptiles. However, reptiles are integrated with the environment for body heat, a very different system than mammalian. Rattle snakes, for instance, could be 'sun worshippers' - they need to collect the warmth of the sun, like solar panels. Mammals have an internal thermostat (
homeostasis). When humans get a 'chill' we're either cold or terrified.
What are reptiles breathing systems? Amphibians mostly have an
external gills.
Most reptiles breathe by changing the volume of the body cavity. By contractions of the muscles moving the ribs, the volume of the body cavity is increased, creating a negative pressure, which is restored to atmospheric level by air rushing into the lungs. By contraction of body muscles, the volume of the body cavity is reduced, forcing air out of the lungs. http://www.britannica.com/EBchecked/...iratory-system