The paint on the sign was cleaned up by Overton Park supporters on Saturday.
Memphis Zoo officials are seeking help from police and the Greensward protesters to find the person or people responsible for vandalizing the large sign for Overton Park that faces Sam Cooper.
The sign has three panels advertising the zoo, the Brooks Museum of Art, and the Memphis College of Art.
Sometime Friday or Saturday, red paint was splashed on the the zoo's panel, which features a panda. Also, the word "no" was scrawled over the words "Memphis Zoo."
Zoo spokeswoman Laura Doty said Saturday that the action is "a cost and liability to the city and the people who love the zoo and Overton Park."
Here's her statement:
"We are working to clean the sign this weekend, and we hope it does not require reprinting.
"While we work with local authorities to find the responsible parties, we encourage the public and the protestors to help the police identify the perpetrators.
"Threats and vandalism to the Memphis Zoo are a cost and liability to the city and the people who love the Zoo and Overton Park."