Pennsylvania’s Norway-rat records concern developed waterfronts, not the wild shore beyond them. Campgrounds, buildings, bins, and stone banks at Pymatuning or Presque Isle provide resources, while river towns and visitor areas create similar pockets inside Delaware Water Gap.
Records rise in May and October as spring park use and autumn cleanup increase encounters in human-used spaces. Those peaks show when rats were noticed, not how many occupied a site.
Full species profile
