text:  Embedded in a rocky hillside in Colorado is a very unusual type of nursery. This so-called mega den hosts hundreds of pregnant rattlesnakes ready to give birth to their pups. You can watch all of the action yourself from a safe distance, of course, with something called Project Rattlecam. It's a webcam aimed right at the den and is revealing surprising new insights into the snake's behavior. Scott Bobak is professor of biology at Dickinson College and co-leads Project Rattlecam. Welcome.