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Some snake repellents are risky to use around people and pets because they use the active ingredient in mothballs, naphthalene. The United States Environmental Protection Agency (EPA) has classified naphthalene as a carcinogen that can cause damage to the liver, neurological issues, and cataracts. 

The Colorado State University Extension suggests there’s not enough conclusive evidence of the effectiveness of snake repellents to recommend their use.

Sure, they are icky to behold, but are silverfish bad? In terms of illness or injury to humans, the answer is no because they don’t bite or carry disease. However, they can damage household items, including books, wallpaper, certain foods, and clothing, as they love to feed on starchy materials and adhesives. What’s more, their presence often indicates high humidity or moisture issues in the home, which can lead to further pest problems.

Both spikes and loose nets can be installed over nest sites to prevent the bird from returning, but nets are not a humane option since birds and other wildlife can get tangled in them. 

Spikes are a humane alternative that deter nesting without harming the birds. In small areas, like vents, a very fine mesh net can be installed to prevent the bird from returning. These nets don't generally pose a risk to the birds.

Scent deterrents like ammonia, vinegar, mothballs, and pepper can help keep coyotes away, but these are best used in tandem with other preventative measures. Remember that ammonia and vinegar can kill your plants and/or grass, so it’s best to soak rags in these substances or spray them on hardscaped areas to avoid damaging your landscape.