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Ruffed Grouse will frequently seek gravel and clover along road beds during early morning and late afteroon. These areas are good areas to walk during this time to flush birds. Also, grouse use sandy road beds to dust their feathers to rid themselves of skin pests. Dusting sites are visible as areas of disturbed soils with some signs of feathers. Birds will return to these spots during the late afternoon to bathe in dust and also socialize and mate. The Ruffed Grouse population has a cycle, and follows the cycle no matter how much or how little hunting there is. The cycle has puzzled scientists for years, and is simply referred to as the "grouse cycle." Minnesota is the top Ruffed Grouse–producing state in the U.S. It is also the state bird of Pennsylvania.