They are extremely entertaining. Just wait till they mature. If your home alone, late at night and the male starts calling...get ready to have the bejesus scared out of ya...sounds like a monster from a 'B' movie is loose in the house.First time, mine did it, I got up with my pistol and went looking for this creature!
Here's a vid of one calling but unless you turn the volume all the way up, you won't fully appreciate how loud they really are...
Here's what the females sound like.

