Narrator: This is Science Today. Several years ago, paleontologist William Clemens discovered the remains of a colony of duckbill dinosaurs that lived in Alaska 70 or 80 million years ago. Alaska was a lot warmer then, but it still got dark three months out of the year, so scientists thought the dinosaurs migrated thousands of miles to Canada every winter.
Clemens: And this migratory hypothesis was appealing, seemed logical, something to think about. But then as we started looking at the micro fossils, we found teeth of baby dinosaurs, little hatchlings.
Narrator: And thatís evidence, says Clemens, that the dinosaurs stayed in Alaska all year round, in spite of three months of winter darkness. The fossil records shows that duckbills were conscientious parents who didnít abandon their young.
Clemens: I can see a big adult migrating several thousands of miles in the course of a year, but little babies? So I think the young ones probably stuck it out up there, which gives us a another window on the physiology and development of these dinosaurs.
Narrator: For Science Today, Iím Larissa Branin.