Lifestyle 'Dinosaurs Among Us' opens at the American Museum of Natural History Print Share fbShare Tweet Email “Dinosaurs Among Us" opens on March 21 at the American Museum of Natural History. The exhibit explores the fascinating connection between the captivating beasts that roamed the earth 170 million years ago and today’s birds. It will be open through Jan. 2, 2017. Comments We're revamping our Comments section. Learn more and share your input.