I went out to feed my (2) 7 month old peacocks today and I noticed that their crests on top of their heads (hope i'm using the correct term) are missing. What do you think could have happened to them? Will their crests grow back? If so, how long will it take? They are in a locked cage that is secure so there is no way that anything could have gotten in to get to them. Could they have picked each other?