Starlings, in their varieties Sturnus vulgaris and black starling (Sturnus unicolor), are not considered to have harmful effects unless there is great overcrowding.
This phenomenon mainly affects rural areas, home churches, ruins, cottages or high houses. In other countries such as Italy, it’s Rome which has significant populations of this species.
Starlings are associated with high concentrations of specimens, it can reach hundreds of thousands. The usually draw fanciful figures in the sky.