After you howl, you may well receive a vocal answer. Many times, the real coyote will challenge you to a fight or warn you to get out of town before he kicks your butt. The challenge sometimes is low pitched and sometimes high pitched like this. high challenge If you do get a vocal answer, quickly imitating what real coyote just said is one way to make him come running in for a fight.
Edit: Sorry..wavs will work now......Bob/SoCal