another boggling one:
http://www.boingboing.net/2010/07/29/when-2-dinosaurs-bec.html'Certain dinosaurs?physically disparate enough that we've always thought of them as different species?may actually be the same animal at different stages of its life cycle. Also: Those big, protective-looking bone formations surrounding some dinos' heads and necks probably weren't all that useful as a defense against predators...'