Found cat in Frank Holten State Park

Hi all. I found this cat in Frank Holten State Park on Saturday. He's an unneutered male, incredibly friendly and clingy, very vocal. I can't keep him long-term - I have a pet rabbit who free roams - but he's safe and hanging out in my spare bedroom right now. I've called a shelter to see if they can help but am also posting around in case he's lost. ETA: Dropped him off at Gateway Pet Guardians earlier this afternoon. Hopefully he'll be able to find a home soon!