Thunderbird

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.