This is something I have to deal with worrying about coming down from Hurricane Ridge. There are ALWAYS deer grazing by the roadside. They are very used to cars, and mostly don't move. But, they get more startled by fast moving bikes. Still, mostly they stay put...but not always.
Is it enough to keep me moving really slowly down a 20 mile, 5000 foot drop? No. But, sometimes I wonder.
"The best rides are the ones where you bite off much more than you can chew, and live through it." ~ Doug Bradbury