A bird-scarer is a device used to keep birds away from crops or specific areas of property. There are several synonyms for this term, including bird deterrent, bird repellent, and bird frightener. Other related terms include bird pest control, bird exclusion, and bird netting. These devices are commonly used in agriculture to protect crops from bird damage, as well as in residential settings to discourage birds from nesting or roosting in unwanted areas. Regardless of the specific term used, these methods are designed to provide a humane and effective way of controlling unwanted bird populations and preventing damage to property.