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2. Animal repellent - Wikipedia

   en.wikipedia.org/wiki/Animal_repellent

   Animal repellent. An animal repellent consists of any object or method made with the intention of keeping animals away from personal items as well as food, plants or yourself. Plants and other living organisms naturally possess a special ability to emit chemicals known as semiochemicals as a way to defend themselves from predators.

3. Acoustic harassment device - Wikipedia

   en.wikipedia.org/wiki/Acoustic_harassment_device

   Acoustic harassment device. Acoustic harassment and acoustic deterrents are technologies used to keep animals [1] and in some cases humans away from an area. Applications of the technology are used to keep marine mammals away from aquaculture facilities and to keep birds away from certain areas (for instance in the vicinity of airports and ...

4. Electronic pest control - Wikipedia

   en.wikipedia.org/wiki/Electronic_pest_control

   Contrary to popular belief, birds cannot hear ultrasonic sound. [3] Some smartphone applications attempt to use this technology to produce high frequency sounds to repel mosquitoes and other insects, but the claims of effectiveness of these applications and of ultrasonic control of pest creatures in general has been questioned.

5. Bird control - Wikipedia

   en.wikipedia.org/wiki/Bird_control

   Bird control. A top of broken glass provides an effective physical deterrent [citation needed] to birds considering resting on this wall. Bird control or bird abatement involves the methods to eliminate or deter pest birds from landing, roosting and nesting. Bird control is important because pest birds can create health-related problems through ...

6. Bird scarer - Wikipedia

   en.wikipedia.org/wiki/Bird_scarer

   A traditional scarecrow. Bird scarers is a blanket term used to describe devices designed for deterring birds by startling, confusing or otherwise repeling them, typically employed in commercial settings by farmers to dissuade birds from consuming and defecating on recently planted arable crops. Numerous bird scarers are also readily available ...

7. Cat repeller - Wikipedia

   en.wikipedia.org/wiki/Cat_repeller

   Cat repeller. A cat repeller is a device or substance used to discourage cats from entering an area, or to encourage them to leave if they do enter. Such deterrents are most commonly used by gardeners, in order to prevent damage to their gardens, to avoid cat feces, or to protect birds.