Just saw this on the bbc website: Polar dinosaurs used burrows to protect themselves from harsh climate conditions. Personally I never knew that about dinosaurs, it seems you learn something new every day... also, a new species of ornithopod dino was discovered.
Nice find. Another fine example of the versatility of dinosaur behaviour.
I seem to remember a reported hadrosaur that was supposed to have been hibernating when it died. I wonder if this is the one they refer to?