Check the listing for details. Androsaurus Head Fossil. Condition: Used. Listed at 10553.40 USD. #Hadrosaurs “chewed their food” in a fashion, as a kind of cheek kept plants in the mouth whilst fore/aft grinding. The #hadrosaur dental battery allowed them to grind tough plants. Individual teeth are super skinny and wedged so tight against the next tooth it looks like, and functions as, one continuous tooth across a jaw.