Mel on the roof
As Sydney gets closer to laying her eggs, a 3rd (friendly) owl visits. Not a good thing. Sydney is defensive, Mel flies in to the rescue. Not on film - 30 minutes later Mel brought Sydney a yummy treat.
UFO Owl came by for the second time. Sydney chased it off - this time we got a clear view of it landing on the playground, up to the outside of the box and direct face off with Sydney. Although she chased it away there was no "fighting". More like a "This box is taken" attitude.