"Ultrasonic acoustic surveys of state endangered northern flying squirrels in the Pocono Mountains, Pennsylvania."
Article in Journal of Fish and Wildlife Management, Dec. 2020
Dr. Gilley says: Surveying for flying squirrels by using traditional techniques produces extremely low detection rates compared with ultrasonic acoustics. Within Pennsylvania, the northern flying squirrel is state listed as endangered due to habitat loss and parasite-mediated competition by and hybridization within the southern flying squirrels. Acoustics provide an accurate and rapid assessment to monitor population over time to better address management needs.