Walking With Dinosaurs - Ep 5 Spirits of the Ice Forest (1999) [576p]

Throughout the entire time of the dinosaurs there were no ice caps on the poles. In the mid Cretaceous thick forests covered Antarctica. Although the climate here was warm, during the winter the sun would set completely for two months and then for the first time in their history dinosaurs would have faced ice and frost. The animals that lived here evolved to cope with what was, by dinosaur standards, the most extreme of environments.