This caused most of the Scouts to wake up to see what the wolves were howling about.  We had left the external microphones on overnight, (on purpose because it was nice to hear the crickets chirping inside), and the howling came through VERY loud.  Then, after the howling stopped a few minutes later, the Scouts all went back to sleep again.   By day 8 in a trip like this, they sleep like the dead until forced to wake up.