0: What's the minimum number of geese needsed for an aerodynamic advantage?

JENNIFER HARVEY I Sandpoint, Idaho

EVEN TWO GIESE flying together can benefit from aerodynamics. They can switch their positions, tak­ing turns helpJns each other by creating air currents. When a flock hastbree or more members, it can form a V, where each bird helps the birds behind it by cre­ating an upward force of air called "upwasb ... This dy­namic has no maximum number-it's more a matter of ?e need for geese to maintain contact Within their flock. It's harder for laiger tlocks to stay together, as any9.DO who's traveled lnJ)Ja groups can tell you.