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Numerous predators kill hornets, including frogs, birds, lizards, bats, spiders, and hedgehogs. Some larger predators, including rats, skunks, and racoons, will occasionally attack a hornet nest in order to eat the larvae inside. These natural predators typically don’t eat enough hornets to make them an effective form of hornet control. 

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.

Rabbits have a penchant for plants, relishing herbs, veggies, fruits, and grasses. Common herbs like mint, basil, and cilantro are fair game for rabbits. In fact, leafy greens such as mint and thyme are rabbit favorites. Not only do bunnies find it yummy, but it packs health benefits when consumed in small amounts.

Iguanas cause a variety of damage to properties and pose other dangers. Their tunnels can collapse seawalls and foundations. They destroy native plants, trees, gardens, and agriculture. They compete with native animals for food. Their droppings, left almost anywhere, can transmit salmonella which is especially dangerous to vulnerable groups like children and the elderly.