Friends of the Patuxent Wildlife Research Center - Working to support the missions and programs of the Patuxent Research Refuge and the Patuxent Wildlife Research Center. Events, profile, newsletter and membership information. - http://www.friendspwrc.org/
Chesapeake Wildlife Heritage - The nonprofit organization dedicated to creating, restoring and protecting wildlife habitat in the Chesapeake Bay watershed. - http://www.cheswildlife.org/