Thunderbird reports from the 1880s
2 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 · 1882
Witnesses report winged crocodile-like monsters encountered by lumberjacks in Hurleton California and Missouri.

Thunderbird · Arizona · 1882
Witnesses report a monster eagle measuring 7 feet 4 inches was killed after attacking a man in Arizona.