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Is it true that some of the herbivores had to move their jaws in a side to side motion to be able to chew their
food?
from Chelsea,
age 14, ?, ?, USA; July 19, 2001
MIKE: The "side to side" movement of the jaws in herbivorous dinosaurs is not the same as the side-to-side movement in cows - despite what you see on poorly produced recent TV shows. In dinosaurs such as the duckbill dinosaurs (the most elegant of all the dinosaurs) the upper jaws SWING outwards like a pet-door hinge. The lower jaws just move straight up-and-down.
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