True story.
My Wife works as the Guidance office secretary at Streetsboro High School in Streetsboro, Ohio. For as long as she can remember, every year a hen Mallard has nested in the "building locked" school courtyard. The only access is thru the school. Here is a pic she took several years ago when that exact same thing happened in the spring.
(I apologize for the grainy pics. These were taken before phones were actually "cameras").
Of note, until she showed an interest, (imagine that- from a woman married to a Duck Hunter), these little ducklings would mysteriously disappear. Most probably from a haw, owl or crow.
But one year, several years ago, one of the custodians admitted to catching and killing all the little fellas. That prompted an immediate visit from the local Wildlife Officer. He took names and statements, but unfortunately couldn't really do anything because of lack of evidence. (I wonder who made the call, I did give up the number, but no one would own up to the actual phone call).
Now it's become a big annual thing where the students will actually line the hall as as the ducks walk by.
Jon