Praying Mantises are one of the best natural predatory insects. They keep a wide variety of pest populations under control, from aphids, to beetles, to mosquitoes, to caterpillars, and more! The provided egg case should be affixed to a plant, shrub or tree using the given mesh bag. In 1-8 weeks, the egg will hatch and release praying mantises in your yard. They will stake a territory, prey on pest insects, and eventually lay an egg to continue your population next season. There are no better pesticides, than the kind that don’t harm the Earth!