Mass exodus (or flying south)

Two days ago on the 401 between Montreal and Toronto we were amazed to see disjointed ribbons of geese dotting the twilight sky. Anyone who has made the trek between the two cities at this time of year will remember seeing one, two, perhaps even three flocks of birds cross the highway. To see several flocks, however, flying more or less in a straight line over our heads, mere miles separating them, was not only a source of amazement and wonder but also a fitting tribute to the long, hot summer.