It’s a balmy summer day in Late Cretaceous Alaska around 70 million years ago, and these Pachyrhinosaurus perotorum are out to enjoy their stroll in the woods. Back in the hothouse days of the Mesozoic Era, the polar regions would have experienced a temperate climate like that of the modern American Midwest or most of Europe. It still would have snowed in the winter, but there were probably no polar ice caps in that time.