My old city wasted a fortune trying to put the geese that plagued the parks on birth control. When sanity set in and they hired some one to start shooting them and donating them to the homeless shelter the libs went berserk.
We had a pond that would attract ducks every year. One year someone put an Alligator Snapping Turtle in the pond.
When mother duck would swim along with the new babies in tow all of a sudden a baby would disappear under water never to be seen again. One by one.
One guy fished the turtle out after a few years but the ducks never came back.