Late one September many years ago, I was visiting Pointe Mouillee State Game Area at the mouth of the Detroit River along the western shoreline of Lake Erie in late September when I looked skyward and saw the most stunning example of fall bird migration I have ever witnesse
The vivid image of that annual autumnal spectacle of migration remains in my mind’s eye yet today. But it has always made me stop and wonder: Why do some raptors migrate, while others don’t?
