Bear Lesson Plans
Science Trek has a marvelous set of activities and lesson plans provided by Idaho Fish and Game.
Discovery Education has a series of lesson plans for older students. Some can be adapted for intermediate classes.
Polar Bears International has an entire unit on Polar Bears.
The North American Bear Center has some great lesson plans too. Plus they have live cameras for you to sneak a peek at bears in their natural habitat.
See the Polar Bear at the San Diego Zoo by live cam.