Ruffed grouse populations are surveyed by counting the number of male ruffed grouse heard drumming on established routes throughout the state’s forested regions. Drumming counts are an indicator ...

Ruffed grouse populations, which tend to rise and fall on a 10-year cycle, are surveyed by counting the number of male ruffed grouse heard drumming on established routes throughout the state’s ...

The ruffed grouse has been Pennsylvania's state ... During mating season, which is March and April, male grouse attract females by drumming. With their tail fanned, the male stands on a large ...