Ted, Al, thanks on the ID. The legs confused me although the reddish below is unlike the Yellowlegs. Btw, here is another blur of the same bird as it flew past me. Settings were -
40D, Sigma 50-500mm @ 191mm
1/80 sec, f/6.3 Mode: Av Metering: Evaluative Exp comp: -1/3 ISO: 400 Hand held