Brooks Falls is one of the best places in the world to watch brown bears because it is one of the first streams in the region where energetic and pre-spawned salmon are available to bears. In July, most salmon are moving through large rivers and lakes where bears cannot successfully fish. Early in the salmon run, Brooks Falls creates a temporary barrier to migrating salmon. This results in a particularly successful fishing spot for bears. Once salmon stop migrating in large numbers, Brooks Falls is no longer a good place to fish and bears quickly abandon that spot for better fishing elsewhere. 4. When is the mating season for bears?