Murie Audubon Society - Based in Casper. Newsletter, Audubon Center, contacts, and links. - http://www.murieaudubon.org/
Meadowlark Audubon Society - Serves the four counties of the Big Horn Basin of northwestern Wyoming. Events, information about books by members, conservation issues, newsletter articles, trip reports, local directions to birding spots, and club information. - http://www.meadowlarkwyo.org/