By: Thayer Birding Software
10,241 species are listed in the program, as well as 500 sub-species that may soon be elevated to full species status, plus over 20,000 alias names. Checklists for each US state and province are included as well as checklists for all countries of the world. The list of birds included follows the AOU taxonomic list and includes the 44th Supplement changes made in 2003.
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