Like the house sparrow, the starlings are well adapted to urban life. Starlings are very aggressive and will drive native birds out of their territory, much to the dismay of local bird watchers. They are well noted for their flocking habits. Starlings often roost in populated areas, for this reason, they rank just behind pigeons and sparrows as an urban bird pest. Large scale building of feces can lead to structural damage. Gutters and drainage pipes clogged with starling nests often backup, causing extensive water damage.