If last week's post about the Demon Ducks of Australia wasn't sufficient to scare you into stopping your project to build a working time machine so you can study prehistoric life first-hand, take a look at a different recent fossil discovery -- this one of a bird with a six-meter wingspan...
... and teeth.
Well, pseudoteeth, says the Wikipedia article on pelagornithids, because they don't have the same structure as true teeth and are actually outgrowths of the premaxillary and mandibular bones. But that would have been little consolation to their prey:
It's easy to look around at today's chickadees and warblers and think of birds as being small, feathery, fluttering creatures who are more often prey than predator. But even today we have, as a reminder that birds are dinosaurs, species like cassowaries: