Gulls are generally, but not exclusively, coastal birds. There are at least five common around the UK. Gulls are pests within coastal towns. However, Herring Gull and Lesser Black Backed Gulls over the last century have spread inland and are now resident within cities such as Birmingham and the Severn estuary where they have actively sought to steal food from humans. Due to their size they can cause a lot of fear.
The most common pest Gull seen is the Herring Gull. In their natural environment disputes between territory holders normally pull up grass to displace others. However, grass is usually absent upon roofs hence they pull anything else, causing physical damage to items such as air conditioning insulation and even roof felt or lead flashing.