Non-avian dinosaur eggs took a long time to hatch — between 3 and 6 months, according to new research on the teeth of fossilized dinosaur embryos. Herds of female titanosaurs gathered at traditional nesting grounds 80 million years ago in what is now Patagonia, Argentina. Image credit: Luis Rey / Yale University. “Some of the greatest riddles about dinosaurs pertain to their embryology — virtually nothing is known,” said Prof. Gregory...
