Two of my roosters feel the need to crow (for about 10 mins) at randoms times during the night. Why do they crow at these random time through the night? Are they hearing something they dont like? At first I though they might be hearing critter's and going on "alert", but last night I slept with my window open and checked every time they started to crow and found nothing...no critter/pred's in sight. The two offenders!!!