Thunderbirds: America's Living Legends of Giant Birds
"In Thurnderbirds, Mark A. Hall reviews, for the first time, in one place, all that we know about the reality of large, condor-like birds, which have been reported for centuries in the Americas.  For decades, Hall has researched the subject of these large birds and their allies (the giant owls).  His tour of the accounts is masterful, for he places them in a context others never have…Hall also shines a light on the most likely candidate for Thunderbirds, the prehistoric giants, and the recently extinct teratorns.  The long list of Thunderbirds and other big bird sightings collected over the years may have to be reexamined someday by ornithologists.  But for now, Hall’s work preserves the record of the flight of the Thunderbirds." -  From the Introduction by Loren Coleman