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A Comparison of Certain North American Birds to the Thunderbird
http://cryptosquared.tripod.com/insights/tbirdcomp.htmlAn article by Willie Shughart that compares "five of the largest birds to occur in the contiguous United States and southern Canada" to the thunderbird.
Submitted in section: Cryptozoology: Thunderbird: A Comparison of Certain North American Birds to the Thunderbird