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Skunks are generally nocturnal and begin foraging at sunset. Skunks are omnivorous and help keep the rodent population in check. They often travel five to ten miles within their territory at night looking for field mice and other small rodents as well as lizards, frogs, birds, eggs, garbage, acorns, and fallen fruit.

They also dig for insects, especially beetles, larvae, and earthworms. Their diet includes black widow spiders and scorpions. Being carrion eaters, they help keep roadways and neighborhoods clean. An estimated 70 percent of a skunk's diet consists of insects considered harmful to humans.

Source: www.projectwildlife.org