Species Protoceratops
HyLpacrosaurus species
The results show that, during the development process, each day, different circles appear on the teeth. Thus, scientists have determined the age of the embryo and the hatching time of Protoceratops is 3 months while in Hypacrosaurus species it is 6 months.
This study has shown the development of dinosaur eggs closer to reptiles than birds.
Hypothesis of the migration of dinosaurs was rejected
Embryonic studies have also raised objections to the previously proposed hypothesis of the migration of dinosaurs: dinosaurs undergo polar summer and winter in southern Canada.
According to this new study, dinosaurs take a long time to hatch, waiting for the young adult to migrate, so the journey cannot be done.
Cause of the extinction of dinosaurs
Because of the long period of incubation and the young needing more than a year to mature, dinosaurs are more disadvantaged than amphibians, mammals, birds or other reptiles that survive the great extinct at the end of the Cretaceous period.