As I watch waves of migrant birds move through our valley, beginning in mid-July with rufous hummingbirds and a few early shorebirds, followed by raptors pouring over the Wellsvilles mountains in mid-August, then September when many of our songbirds head for the tropics, and lastly in November come the waterfowl- ducks, geese, and swans stream through by the thousands, I am thunderstruck. The remarkable physiology that allows our avifauna to find their way through storm and unimaginable