Walden Biodiversity Day

The Results Are In

UPDATE – December 23, 2009 – Peter Alden’s final report on the groupings of organisms and the people who found them during Walden Biodiversity Days in 2009 and 1998 is finished and can be downloaded here (5.7 MB).

Thank you for your interest and participation in Walden Biodiversity Day, and for helping make the event such a success.


Peter Alden, Richard Primack & E. O. Wilson

Our reports and checklist now combine the historic 1998 event with this summer’s Walden Biodiversity Day II. The total number of species seen during both events now stands at 2,579.

Thanks again for all your help and please send any corrections or comments on these reports and checklists to peteralden@aol.com.

Peter & Ed

Walden Biodiversity Day Photography

View and comment on all the photography from Walden Biodiversity Day II here: http://picasaweb.google.com/waldenbiodiversity

Walden Biodiversity Day ~ July 3rd & 4th, 2009 ~ Rain or Shine

The Walden Woods Project is sponsoring Walden Biodiversity Day – an effort to identify “2009 species in 2009” in historic Walden Woods and surrounding Thoreau Country (Concord, Lincoln, and Carlisle, MA).  The event is being organized by naturalist/author Peter Alden and cosponsored by the National Park Service and Minute Man National Historical Park.  A number of other supporters have generously contributed to make this a successful event.

Walden Biodiversity Day is the second gathering of select top naturalists from the Boston area and from Maine to New York, many of whom participated in the first Biodiversity Day (organized by Dr. E.O. Wilson and Peter Alden) in 1998.

E. O. Wilson

Invited field biologists will fan out to find, identify and get photographs of over a thousand species of mushrooms, plants and animals in a day, with a goal of 2009 species. Edward O. Wilson will join us in the field and at the Concord luncheon and Lincoln dinner in honor of his 80th birthday.

Walden Woods Institute

Walden Woods Project's Thoreau Institute

The Walden Woods Project, a national non-profit organization founded by recording artist Don Henley, protects a large area of Henry David Thoreau’s iconic Walden Woods, maintains the largest collection of Thoreau and Thoreau-related literature in the world, and has active programs for teachers, students and adults.

The pages on this site provide a schedule of events, maps to the meeting places and several of the possible field sites, as well as the list of over 1900 organisms identified in 1998.