This data is interesting, but comparing two data points, 1965 and 2016, is much less helpful than some trend lines would be WW2 ended in 1945. I'd imagine that

This data is interesting, but comparing two data points, 1965 and 2016, is much less helpful than some trend lines would be WW2 ended in 1945. I'd imagine that was probably an absolute low point for most mammals in Europe