Starlings also create formidable problems for livestock and poultry facilities, congregating at feed troughs to eat, and contaminating food and water sources in the process. Starlings are also known to enter buildings to roost and build nests, creating sanitation problems.

What's so bad about starlings?

They are considered invasive by the US Fish and Wildlife Service. Their corrosive droppings can damage all kinds of objects and surfaces. They spread the seeds of weeds and eat large amounts of grain crops. Because of their enormous flocks, they can interfere with aviation.

Why are common starlings a problem?

The most common problem caused by starlings are damage to crops and berries. When these birds are not eating pests, they in turn become pests and destroy farmers' crops. Another negative impact is driving out competitors. Because starlings are so aggressive and gregarious, they force out many native species.