I heard there is a park in Alaska where they have both black bears and grizzlies. Due to the danger of the grizzlies they hand out pepper spray and whistles to scare them away. They recommend keeping a sharp eye out for bear scat so you know what type of bears are in your vicinity. The scat from the black bears is full of berries and nuts. The scat from the Grizzlies is full of whistles and pepper spray.