Real-time composite of 3 shots in which the 'ABT' (upper bird) flew briefly in parallel with the 'WWBT' (lower bird), allowing both the dusky underwing (left) and grey flanks (esp. centre) and restricted 'headphones' head-pattern (right), reminiscent of accompanying WWBT, and uniform rump/tail all to be distinguished. The extreme midday light has bleached out the true grey tones of both birds. Image created from 3 similarly converted RAW files assembled in photoshop. Left to right = ~0.5 seconds.
Canon 40D, 300 mm lens, 1/1600 sec, F6.3, hand-held.