Susan, a few things here. First, where you had a bad experience with a cyclist, was it on one of the STA trails? If so, I would caution you to expect high speed bikes there. We gladly welcome pedestrians on our single track, just understand they are designed for bikes. As for the wildlife conflict potential, this is a city, and whether it's 6-8 miles of new bike trail or new roads or new housing, or new ski trail, or new whatever, the human and urban density will only increase. As a birder, I'm sure you understand the ecological impact is far worse from things other than trails. Third, these single tracks are much different than the paved, city paths. We actually have precious few of these trails and they are getting very crowded and dangerous, so more trails will help to alleviate this and I hope more and more single tack will be added. Please don't form your view of bikers based on a couple bad apples, I don't form my opinion of hikers based on a few angry opinion articles.