rsbob 

Was Mtn biking with my then black lab up in heavy forest. We were heading down one of my favorite single tracks at 15 when on my right I heard, but could not see, a tremendous crashing through the brush on my right. I immediately knew it was a black bear. The fork of the trail was heading right to the sound. I stopped the dog and I pedaled as hard and fast back up the trail as possible until the noise receded. We never saw or smelled one another and luckily the dog was oblivious. If I was wearing earbuds, it might have become dicey.