sign seen in Banff, Alberta
Banff, Alberta is in the Candian Rockies and the hiking areas around it have significant populations of both black and brown bears.
A sign I saw when visiting (a paraphrase)
granted, I saw the sign in a gift shop....;)
WARNING--both black bears and brown bears frequent these trails. You should carry bear bells, and have pepper spray close at hand. Keep aware of signs of bear presence, particularly spoor, and know the difference between that of black and brown bears. Black bear spoor will have partially digested berries, with bits of leaf and twig. Brown bear spoor will contain little bells, and smell faintly of pepper.