This story about a pipeline digger cracking through a fossilized dinosaur tail made me wonder: Does handling dinosaur bones make one Tamei?
Lizards are considered Sheratzim, but by and large Sheratzim are "creepy crawling things", so maybe only smaller dinosaurs, especially small, four-legged dinosaurs fit the description. Some claim that dinosaurs were part of an earlier creation that was later destroyed; if so, would small, Sheretz-like dinosaurs even count?