Watch, wait and be prepared. Because the flocks are closely knit, it takes some effort to separate out a bird from the others.
The birds of a feather, do indeed flock together. At the morning launch, the snow geese seem to get the clearance for takeoff before the Sand Hill Cranes. They take to the sky as a flock, same as they sleep as a flock. This guy was one of the last to get the wake up call. He was having traction issues on the ice, before he got airborne.