Bark or Vocal Clamor?

Tonight as we were checking the camera trap, we heard a bark. Leotis (not his real name) had heard the barking earlier and then saw the fox. Plus the barking we heard was coming from the direction where Leotis saw the fox go. What I'm wondering is, was it a bark or a "vocal clamor"? The animal diversity website (under my links) says this: "Copulation usually lasts 15 or 20 minutes and is often accompanied by a vocal clamor. " This is mating season after all. In 53 days we might have baby foxes!