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Squirrels hate not having access to secure shelter or food sources. Your best line of defense is to make your property less attractive by removing access to these things. There are chemical squirrel repellents, but these have mixed success. According to Pennsylvania State University, you can apply products containing the bittering agent denatonium saccharide to a squirrel's favorite fence, tree, or roof spots. However, you need to reapply repellents regularly, which aren’t scientifically proven effective.

Generally, squirrels are not considered aggressive toward humans. They are more likely to flee than confront people. However, like many animals, they may exhibit aggressive behavior if they feel threatened or cornered. If you approach a squirrel too closely or try to handle it, especially if it's a mother protecting her young, it may resort to defensive tactics such as biting or scratching.

Like any other animal, rats are attracted to food sources, water, and shelter. Clean up food messes right away, don’t leave pet food out, and secure your garbage to make your home less appealing. Fix leaky pipes and dripping faucets, and declutter spaces that rats might think to nest in.

It's advisable to avoid using harmful methods to eliminate birds. Poisoning birds is inhumane and can have unintended ecological consequences, affecting other wildlife and pets. Similarly, using firearms or other lethal means poses safety risks and could be illegal in many areas. Sticky substances like adhesives can cause birds to become trapped and injured. Lastly, playing excessively loud or distressing noises can stress birds and humans. Focusing on humane and environmentally responsible strategies is essential when dealing with bird issues.