It seems the so-called mystery pooper is becoming something of a legend in Ypsilanti.

A billboard recently appeared along Interstate 94 near the South Huron Street exit that seeks to flush out whoever has been depositing feces on a slide in Prospect Park.

Update

There are several rotating messages, including "Do your civic doody, report the pooper," "Help us flush the pooper" and "Help us catch the poopetrator."

The Twitter hashtag #ypsipooper accompanies the messages, as well as a man dressed as a superhero wearing a T-shirt featuring a pile of poo in a circle with a line through it.

The billboard is owned by Adams Outdoor Advertising. Who rented the sign also remained a mystery Friday morning.

City and police officials recently expressed concern about repeated instances of feces being left on a children's slide at the park. Officials have discovered feces on the slide so frequently that police installed a hidden camera to try to capture an image of the act.

Police are continuing to investigate. If you have any additional information regarding the 'mystery pooper,' please contact Detective Sergeant Tom Eberts at 734-482-9878 or Crime Stoppers at 1-800-SPEAKUP (773-2587).

John Counts covers crime and breaking news for The Ann Arbor News. He can be reached at johncounts@mlive.com or you can follow him on Twitter. Find all Washtenaw County crime stories here.