It was probably fifty years ago when I first read Konrad Lorenz's King Solomon's Ring. The image above provoked a memory of one of the stories in the book. It seems that the Lorenz residence included many of the animals curious zoologists tend to accumulate, including graylag geese. The geese had the run of the ground floor of the house, and their deposits littered the floor. Lorenz's grandfather, whose vision was failing, had frequent, unsanitary encounters with these.
So when I first saw what you see in the image above, it was easy to imagine that a flock of thousands of well-fed geese had recently roosted on those ball fields.
But geese are not to blame. An aerator had recently worked the fields, and the results when wet will be just as messy as what geese leave.