We head for the cold shores of the Great Lakes looking for the winter homes of black bears. They may be hibernating but that doesn't mean they are sleeping as things get Xtremely Wild underground. And later a research project designed to reintroduce grizzly bears back into the wild gives a check of two of it's star pupils. It's been a long winter with no food and a lot of sleep. Join Mark and the Xtremely Wild crew as they give the two bears a spring time weigh in.