I put this together for my son's first grade class. There is a companion presentation that goes with it. Ask me for it if you would like a copy. The video and the presentation are open to the public for use and alteration. I request no rights, however attribution can be a nice courtesy. My email address is firstname.lastname@example.org. Just specify weather you would like it in OpenOffice, PDF, or PowerPoint format.
1. The Presentation is a good segway into a discussion on evolution and or dinosaurs.
2. If you didn't know the answer to the question "why might iguanas need a third eye?" the answer is: to alert the iguana to the presence of predictors such as various birds of pray.