Which of the following is not listed as a bird deterrent method in the material?

• A. Chemical repellents
• B. Auditory frightening devices
• C. Visual frightening devices
• D. Monofilament lines

Answer: (A)

The material categorizes bird deterrents into behavioral and physical methods, focusing on how to modify birds’ actions or restrict access. Auditory frightening devices use sound to startle or deter birds, while visual frightening devices rely on sights to scare them away. Monofilament lines act as a physical barrier that prevents birds from landing or perching in treated areas. Chemical repellents, on the other hand, are not listed as a deterrent method in that material, even though they exist in other contexts, because the material emphasizes non-chemical approaches. That’s why chemical repellents are the option that isn’t listed.