National Audubon Society
http://www.audubon.org/

Michigan Audubon
http://www.michiganaudubon.org/

http://www.capitalareaaudubon.org/

Baker Preserve
MAS webpage

Baker Trail Map

Michigan Bluebird Society
http://michiganbluebirds.org/

THE guide to birding in Michigan
Available from the MAS bookstore, Discovery Center in Waterloo Recreation Area, and online at Amazon. 
NOTE: A second edition is now available.

Cornell Lab of Ornithology
http://www.birds.cornell.edu/

Whitefish Point Bird Observatory
http://www.wpbo.org/