Hi Stephanie, As I recall, the geese at the end of the vee (not the tip), are invariably immatures, and aren't likely as strong as the adults. I've never seen immys at the tip, maybe because they lack experience to know the way, maybe also because they aren't strong enough. Best regards, Dick Musser(4mi. NW of Vale) On Tuesday, February 3, 2015 9:11 AM, Stephanie Hazen <stephaniehazen17@xxxxxxxxx> wrote: http://www.bbc.com/news/science-environment-31060155Check out this BBC video on the hows and whys of birds flying in V formationStephanie