Blue Bird Territory Squablble

ANother Blue Bird couple was moving into an available nest box about 50 yards from the current Blue Bird couple that had a second brood started. This went on for about 15 minutes, and the females joined in also. When all settled down, the new couple settled in to the available nest box (in the front yard) and the current couple settled in back in their area (in the back yard). Both yards have their own food source and water.