Bart was an Alaskan Kodiak bear born on January 19 1977 at the Baltimore Zoo When Bart was five weeks old and weighed five pounds 2 kg he was sold to Doug and Lynne Seus who worked as animal trainers for films The Seuses trained Bart using a reward and praise system While still a cub he appeared in the TV series The Life and Times of Grizzly Adams playing Adams companion bear Ben as a cub After reaching adulthood he made his film debut in the film Windwalker released 1981 He grew to 9 75 290 m tall and weighed 1500 pounds 680 kg throughout his life as an adult