Thunderbird reports from the 1910s
1 case, 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 · Washington, District of Columbia · 1918
A great bird snatched a little person off his pony and flew away with him.