Which deterrent consists of tacky gels or liquids that cause birds to stop attempting to land on treated surfaces after a few tries?

• A. Spikes
• B. Sticky repellents
• C. Ultrasonic devices
• D. Trapping

Answer: (B)

Deterrents that rely on a tacky surface to repel birds are sticky repellents. These products are applied as tacky gels or liquids on surfaces where birds commonly perch, such as ledges, railings, or window sills. When a bird lands, the stickiness makes it hard to grip and can trap the foot briefly, prompting the bird to depart. After a few attempts, the bird learns the landing is uncomfortable and avoids the area in the future.

This approach differs from other methods: spikes provide a physical barrier that prevents perching, ultrasonic devices use sound to deter, and trapping removes birds rather than teaching them to avoid the area. Sticky repellents can be effective but may require maintenance and careful application to avoid mess or surface damage.