[Author’s Note: I don’t think that I have ever traveled so much in my entire life. For the past few months I have been chasing down dinosaurs – and the paleontologists who study them – across the American west, from Ekalaka, Montana to Ghost Ranch, New Mexico. All of it is for my next book, A Date With a Dinosaur, and my journey continues this week. I’m hitting a few stops in California to check out museums, wonder at old bones, and talk shop with dinosaur experts, but while driving across the sea of sagebrush known as Nevada the other day I was reminded of other, more recent creatures who inhabited North