I have been watching for these Pelicans to arrive at this location for several weeks because it provides excellent access.  Today was the first time I had seen them, a single one preening.  I fired off several shots at my normal BIF shutter speed 1/1250 for the record, then cranked it down to 1/640 to reduce the ISO.  THAT'S when he decided to take off in my direction!!!!  I had no time to increase the speed, these are big birds with slow wing beats (thank goodness) but they cover a lot of ground very quickly.
It doesn't help that I'm still fumbling my way around all the knobs and dials on the D500
