Paleontologists recently found well-preserved dinosaur eggs in an enormous nesting ground of titanosaurian sauropod dinosaurs that lived about 80 million years ago (Cretaceous period) in what is now Patagonia, Argentina. In a paper in the journal Current Biology, they now describe an almost intact embryonic skull from one of these eggs, which shows that titanosaurian dinosaurs had stereoscopic vision and an unusual elongated horn on the front of the...