Knowing such itineraries might help us to better understand the nature of massive die-offs (thousands of black birds falling dead out of the sky, for example), or of the itineraries of bio-invasives such as the Burmese Pythons in the Everglades.
One night in early autumn, with the swampy ground of the Nature Preserve papered with fallen leaves, I was hunkered down to examine a dead snake about a foot in length whose color I thought might in life have been green, when, as I stood, I felt something brush the top of my head.