Birds and their ability to Transmit Disease!
Everyone has heard of the 1918 Bird Flu outbreak, well it can happen again.
I had a bird account here in the desert where the club had been sued for miss application of chemicals. The involved member had become deathly ill.
During discovery her testimony included the fact while on one of the water holes that she had picked up her ball to clean it. Believe me that is something that golfers do a lot.
At that point the lawyer pointed out how bird diseases can be transmitted orally by contact with turf and the accumulated droppings to humans.
End of story as the suit was dropped.
There are lakes that I have worked here in the Desert area that have over 5 feet of accumulated bird droppings laying on their bottoms.
Honestly You no longer have clean water but a nasty fecal soup.