Hibernating black bears, particularly mothers with cubs, sleep lightly, and bear expert Roger Powell of North Carolina State University says he has never approached a den in which a resident bear was not watching him come. back to Secrets of Hibernation back to Secrets of Hibernation Animal Transformations | Miracle of Rice Secrets of Hibernation | Build a Rice Paddy | Resources Transcript | Site Map | Japan's Secret Garden Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated December 2000