https://www.flickr.com/photos/austinthomasphotography/14523569474/

https://nestwatch.org/learn/all-about-birdhouses/managing-house-sparrows-and-european-starlings/

https://www.flickr.com/photos/zackie/5261343497

http://www.utahbirds.org/birdsofutah/ProfilesD-K/EuropeanStarling.htm

https://www.inaturalist.org/taxa/14850-Sturnus-vulgaris

https://www.nytimes.com/2016/01/10/nyregion/european-starling-the-bards-bird.html

https://www.britannica.com/animal/starling

https://www.birdwatchingdaily.com/news/science/feather-wear/

https://www.pestworld.org/pest-guide/birds/european-starlings/