Pikas are small mammals most closely related to rabbits and hares. The American pika (Ochotona princeps), lives in rocky slopes in all western US states except Arizona, as well as British Columbia and Alberta, Canada. In recent years, pika populations have been disappearing in some parts of the species range, and scientists are working hard to find out why this might be. Check out the links and videos below to learn more about this research, read blog posts from scientists, and explore lesson plans based on this research!