Upon arriving, I accidentally flushed eight Green-winged Teal from the big tank. Before I realized what was happening a couple of Peregrine Falcons appeared out of nowhere. The ducks dropped back into the tank. Thereafter, they seemed afraid to stay in the water. They hugged the sides of the tank for the rest of the day, and flushing no longer seemed to be an option. I guess Peregrines can pick them off the water. Don't know.
Tomorrow is supposed to be a lovely day so I hope to finish watering and enjoy looking for butterflies.