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First the scientists gathered embryo fossils from two dinosaurs: Protoceratops, whose tiny eggs weighted just 194 grams (7 ounces), and the enormous, duck-billed Hypacrosaurus, with 4 kilo (9 pound) eggs.
Then the team put the embryonic jaw of each through a CT scanner, to visualize the forming teeth, and extracted a number of individual teeth for study beneath a high-powered microscope.
Under microscopic view, Erickson and his team found growth lines on the teeth that helped the researchers establish a timeline for embryonic development.
With slow egg-hatching times coupled with more than a year of maturation outside the egg, the creatures would have been at a disadvantage compared to other animals that survived the great dinosaur extinction event.
originally posted by: Raggedyman
a reply to: TrueBrit
I would imagine that the animals that ate so much food considering their size would need to move or follow a heard. I am basing that on the seasons and what we see in modern day heards following the food sources and predators following them
Turtles bury their eggs and the hatchlings escape to sea. They don't need their parents around, maybe Dino's did something similar
Sorry, I have reasons to doubt a reptile would like to be tied down for 6 months, especialy a big one that would eat all the food sources in the area
Again, I am not arguing the assumption or evidence, just find it a little perplexing, it leaves me with more questions.