Calcified Pineal Gland
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1419179/
This link takes you to an interesting article covering what happens when the Pineal Gland is calcified. The fact that calcification of the Pineal really impairs navigational ability makes us think that this proves that the Pineal is critical to animal navigation.
Richard Nissen
Editor