Several years ago a marsh in our neighborhood got a new lease on life. The choice was made to drain it, remove the fish that had caused it to become less desirable for the waterfowl on their migratory trips and allow the vegetation to gain a stronghold once again.
On one of my visits to this particular Marsh I stirred the winged visitors to a location a short distance away...just inside some plant growth extending above the waters surface. I could go on but I think you get the picture. ;)