Ryebread...you reminded me of a pleasant old experience and thus I am now sharing my random story for today:
So the airport I learned to fly at was bounded on 3 sides by roads and on one side by a creek/river. Every now and then it would rain hard enough to make the river flood. When the river flooded there would be little streams that would run on each side the length of the longest runway at the airport. Now there's a thing called a NOTAM (Notice to airmen)...typically when you are approaching any fair sized airport or taking off from one you tune to a general frequency that will give you all pertinent information for the airport and it concludes with NOTAMs...these can include anything from a runway being closed, to deer on runways, to bird activity in the vicinity of the airport. So one day, sitting on the ground listening to NOTAMs before calling the ground controller I hear "Notice to airmen, caution, fish activity on runways." No joke, taxing out to the runway there were fish swimming alongsides the runways and taxiways in little streams