- 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.
