Cryptozoology Thunderbird
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A Comparison of Certain North American Birds to the Thunderbird - An article by Willie Shughart that compares "five of the largest birds to occur in the contiguous United States and southern Canada" to the thunderbird.
Cryptozoology.com - Thunderbird - An article by Craig Heinselman discussing the cryptid, sightings, and the elusive "Thunderbird Photograph".
Evidence of the Giant Birds - Evidence that the Native Americans legend of the thunderbird is based on fact.
Thunderbird - A discussion of the cryptid and what it might be.
The Thunderbird Petroglyphs of the Upper Midwest - Pictures and article by Kevin L. Callahan discussing thunderbird petroglyphs. Help build the largest human-edited directory on the web.