A puertorican parrot displaying to others of its flock.

Sometimes the puertorican parrots will open partially open their wings when they are displaying to other birds.  My guess is that they do so to make themselves look bigger.  This wing opening is often accompanied with bowing, and a side to side motion.  This particular bird was displaying in front of two other birds who were licking the sap that oozed from a broken banana leave.