About Us

Thayer Birding Software was founded in 1994 by Peter W. Thayer and, with the help of Dave Diehl, developed two software products: Guide to Birds of North America and Birder’s Diary.

Later on, Marty Matulevich continued to develop Guide to Birds of North America and Birder’s Diary was sold to Jeff Jones, who continues to expand the program.

As of December 31, 2020, Thayer Birding Software, LLC was liquidated.
This web site is the personal effort by Peter Thayer to continue to offer the birding software to anyone, at no cost, during the pandemic.

A look back at all the versions of Thayer’s Guide to Birds of North America (1994-2020)