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Game Commission Northeast Region Bio Aide, Robyn Crouthamel, plays the gunk-a-gunk call of the Pennsylvania endangered American bittern while conducting a marsh bird survey in Luzerne County. Throughout May, Game Commission biologists and volunteers—citizen scientists—have been taking to the swamps, playing recordings of bird calls in hopes of eliciting responses. These statewide surveys help biologist locate these secretive birds and provide a better understanding of the statewide distribution