On the roof opposite to my roof, there is a Asian glossy starling couple that have hatched some chicks. Everyday, the starling couple would take turn guarding the nest. The starling would stand at the nest and wait for the other one to come back. When I look at the starling, she went and call the entire flock to the area. Now, I think, the roofs in the row of houses has a lot of starlings living there.