Depending on the location and circumstances, it may or may not be legal to shoot a seagull. In general, it is illegal to kill or injure any migratory bird, including seagulls, without a permit. However, there are some exceptions to this rule. For example, in the United States, the Migratory Bird Treaty Act (MBTA) allows for the killing of seagulls that are causing damage to crops or property, or that are a threat to human health or safety. Additionally, some states have their own laws and regulations regarding the killing of seagulls. Therefore, it is important to check the laws and regulations in your area before shooting a seagull.