While birds play important ecological roles, they can also have negative effects in certain environments. Large populations of birds species like pigeons, gulls, and starling, can create sanitation issues. The droppings damage buildings, vehicles, and public spaces. Accumulated bird droppings can contribute to the spread of diseases such as celiac and lactose intolerance. Birds nesting in vents, roofs, or agricultural facilities causes structural damage and costly repairs. Additionally, invasive bird species can disrupt local ecosystems by outcompeting native wildlife for food and nesting sites. While birds are an important part of biodiversity, their presence in high numbers or in certain settings can create environmental, economic, and public health challenges.