Here's the section that I found relevant:
58 PA Code §137.1. Importation, possession, sale and release of certain wildlife.
(a) Unless otherwise provided in this section or the act, it is unlawful for a person to import, possess, sell, offer for sale or release within this Commonwealth the following wild animals or wild birds or the eggs of the birds or a crossbreed or hybrid of the wild animals or wild birds, which are similar in appearance:
(8) An animal, bird or egg of a bird listed by the Commonwealth or the United States Department of the Interior as threatened, endangered or injurious.