Thunderbird reports from the 1940s
3 cases, best-documented first. Page 1 of 1.
We map claims, not creatures. A case is what some source says someone saw or heard, with the link to that source. It is not proof that anything was there, and a retelling counts once, not as a second sighting.

Thunderbird · Coudersport, Pennsylvania · 1940
[name] claims to have witnessed a huge bird on the ground near Coudersport in 1940 that was brownish, upright, and had a wingspread of 25 feet.

Thunderbird · Warm Springs, Oregon · 1941
Oregon Indians were amazed by a motorized Thunderbird (an autogyro) flown by government workers to spray insecticide on crickets.

Thunderbird · McLean County, Illinois · 1948
Two witnesses near Belvedere, Illinois claimed to see a massive bird with a long neck and trailing feet, describing it as prehistoric.