Thunderbird reports in Washington
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 · Olympic Peninsula Gardens, Washington · 1920
An Indian guide reports a thunderbird of monstrous size nesting under ice that produces noise and lightning by moving and flashing its eyes.