This particular trail journey turned into an adventure.
As I was riding my bike, I saw movement out of the corner of my eye turned to see what I thought was two deer running through the field. Then I realized it was an animal chasing a deer. I assumed it was a coyote and continued with my picture-taking and bike riding.
Upon my return trip, I noticed a line of police cars and other vehicles with flashing lights lining South Boulder Road. It turns out they had a mountain lion caught up a tree. I then realized that it had been this mountain lion that was chasing the deer through the field. By the time I got there, it was getting dark and the police weren't allowing people to get very close (fortunately) to the treed mountain lion, so my pictures of the big cat didn't turn out very well.
However, this was a reminder that we share this trail with numerous wild and domestic critters. One particular goose was much more photogenic than the mountain lion.