Quote Originally Posted by musicalKeyes View Post
I'd also talk about their "smelling" differences, and how they can "see" heat. Bringing in a complete shed is also really fun. You could ask them were their lungs are and then show them were the snake's lungs are, and how long they are, too.
Excellent ideas!

Here's a few other tidbits (at least about bp's - don't know anything about beardies, lol):

Bp's can see uv light and so a rat's urine lights up to them. They can detect differences in temperature of .02* celsius thanks to the heat pits on their nose. They can pick up the most minute of light sources so they can see clearly even in the pitch dark. Their urine is solid waste because their bodies have to conserve water in a dry environment. They don't have eyelids - their eyes are covered with special "eye cap" scales.