Audubon Naturalists Society: www.audubonnaturalist.org

Backyard Birding: http://204.255.212.10/~tross/by/backyard.html

Backyard Wildlife Habitat: www.nwf.org/nwf/habitats/index.html

Baltimore Bird Club: http://204.255.212.10/~tross/baltbird.html

Howard County Bird Club: http://pages.prodigy.net/eckerd/birding.htm#local

Lyric Wild Bird Food: www.lebsea.com/lyric

Maryland Department of Natural Resources: www.dnr.state.md.us

Maryland Ornithological Society: www.mdbirds.org

Patuxent Research Refuge: www.prr.r5.fws.gov

Project Feeder Watch: http://birdsource.cornell.edu/pfw/

Teaming With Wildlife:www.teaming.com

Wetland Sights and Sounds: http://www.iwla.org/sos/awm/enewsltr/2006_volume3.htm