For over a century and a half, dinosaurs were viewed as monstrous, scaly reptiles. Scores of science fiction stories hinged on the peril we would face if we ever got close to one. And though it's still true that encountering a Tyrannosaurus while on foot would likely be fatal, over the past several decades paleontologists have discovered a variety of dinosaurs that aren't nearly as threatening as some of their more prodigious and prestigious relatives. These finds raise a question that I doubt the Victorian naturalists who first described the dinosaurs could have anticipated - who was the snuggliest ...