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Minnesota is home to more than 500 native bee species. Pollinators also include butterflies, moths, beetles and native flies. All play a key role in pollinating many food crops and native plants, but populations have significantly declined worldwide in recent years. A recent study has shown that butterfly populations in the United States have decreased over 20% in 20-years. Population decline of pollinators can be attributed to habitat loss and lack of related nutrition, as well as pesticide use and pathogens. Lawns to Legumes seeks to combat population decline by creating new pollinator habitat and habitat corridors that provide food sources and nesting space for pollinators. The program emphasizes protection of at-risk species, such as Minnesota's state bee, the federally-endangered Rusty patched bumble bee. Populations of the Rusty patched bumble have declined about 80% over the last 20 years.