Ah! The Legendary Thunderbird of Native American Tales, that witness sightings are trying to prove that really exists. Ever since I figured out what the bird image was that was beaded into a necklace given to me by my grandmother who traveled through a Native reservation in the southwest United States many years ago, I have been fascinated to learn more of the mythological bird. Here are Some Interesting links that I came across.
@ The Above Bird Image is credited to the Fortean Times Website.