What's with the woods?

We puzzle over the small patches of woodland which occur every few kilometres. Many are only 10-20 acres. Our working hypothesis is that they serve multiple functions: assist in draining the surrounding fields, provide erosion-preventing windbreaks, provide firewood (we've seen piles of cut logs in clearings), and provide habitat for wild animals, including deer. We were skeptical when we saw our first roadside sign with a leaping deer, until a young deer did just that right in front of the car (going for deer life as Peter said). Fortunately he was driving and his reactions are good, so we stopped in time. After that we were more cautious, especially at night. So far Peter's vigilance has spared half a dozen deer and three hedgehogs. Despite the abundance of wild life, we've seen no roadkill. Peter suggests that the locals pick it up immediately and eat it.