She went about these challenges by chasing and harassing the other bears. However, the most intriguing aspect of her behavior, and one that had us humans chuckling, was quite unusual for a female. Sassy gave birth to a single cub in 1999. Brown Bridget came into the world with a twin sister, Bardot. Volunteers have a difficult time telling them apart unless they are accompanied by their cubs.
Cubs spend eighteen months with their mothers, so a female bear gives birth every two years.
Fortunately, Bridget and Bardot give birth in alternating years, providing us an ideal means of telling them apart. Although they are virtually indistinguishable from each other, their coloration makes them easily recognized by visitors and volunteers. Bridget and Bardot provide us with a wonderful opportunity to document family recognition. There is little in the scientific literature on this topic, so watching their interactions through the years should provide some valuable insights. Black Like Bridget, Thelma has a twin sister whom we have named Louise.