Newborn rattlesnakes at Colorado 'mega den' make their live debut

CHEYENNE, Wyoming — A "mega den" of hundreds of rattlesnakes in Colorado is getting even bigger now that late summer is here and babies are being born. Thanks to livestream video, scientists studying the den on a craggy hillside in Colorado are learning more about these enigmatic — and often misunderstood — reptiles. They're observing as the youngsters, called pups, slither over and between adult females on lichen-encrusted rocks. The public can watch too on the Project RattleCam website and...