American Bittern

Ya, definitely a bittern, idk what species though.

See if there's a wildlife rehab with a vet. If they get him in quick they can usually save them if their injuries aren't too bad - watch out for that beak during transport.

DEFINITELY CALL A WILDLIFE REHABILITATION CLINIC!

call these guys: http://www.owl-online.org/

Any ideas what I should do with it?

bitterns live throughout north america in fields and wetlands like most herons. Bitterns are very secretive though and hard to find.

I think he was hit by a car

Awww, what happened to him?

I've never seen one of these in southeast Kansas. Are they common?

nope thats a bittern