"Palaeontologists have long been perplexed by dinosaur fossils with missing pieces – sets of teeth without a jaw bone, bones that are pitted and grooved, even bones that are half gone. Now a Brigham Young University study identifies a culprit: ancient insects that munched on dinosaur bones."

Read more (http://news.byu.edu/archive08-May-dinobugs.aspx)

i wonder if dinosaurs were fully physical creatures since the bones are so big. it seems like it would be hard for them to move.

http://news-service.stanford.edu/news/2002/march6/trex_video-36.html

"An international study, led by the University of Bristol, shows that during their last 50 million years of existence, dinosaurs were not expanding as actively as had been previously thought and that the apparent explosion of dinosaur diversity may be largely explained by sampling bias."

Read more (http://www.bris.ac.uk/news/2008/212017945453.html)