There are some deer in this area but they are so shy that I have only seen them 4 or 5 times in the 30 years that I have lived here. One of those occasions was when I was doing a fast descent on a narrow lane with dry stone walls either side. Suddenly a deer jumped over the wall on my nearside and cleared my head by a couple of inches!
(The hillside sloped steeply up to my left so the deer only had to jump a foot or so to clear the wall and the road was 4 or 5 feet lower.)
It landed safely on my right and promptly jumped over the other wall and disappeared into the woods.