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The Family Handyman DIY Tip of the Day: How to Attract Bats. Despite their contribution to Halloween folklore, bats are one of the most beneficial creatures in nature. They’re voracious insectivores with an appetite for mosquitoes and many other flying pests. To invite bats to share your space, all you need is a cedar bat house (22 in. high, 15 in. wide and 3-1/2 in. deep) hung in a high place.