The day I took my son to the Bosque, we photographed with Artie's IPT group for a couple of hours in the afternoon. Due to a southwest wind and clear skies, I decided to take my son to the flight deck for the evening fly-in. The flight deck was mobbed because it was Saturday of the Festival of the Cranes. We were lucky to find ourselves a spot up front, and waited for the birds. The conditions were perfect! The problem was that only 3 or 4 birds flew in before the sunset, and they all flew at a considerable distance relative to the deck. Fortunately I had my 600 with a 1.4x on a 1.6 body, or else this shot would not have been possible.
Canon 7D, 600mm + 1.4x, f/6.3, 1/1250, ISO 640, manual exposure, hand held