Lots of Bonaparte's along the Kitsap peninsula for several weeks. When I
observe them, (several days a week during work) they are mixed with several
other gull sp. and skimming for fish, but these are pile perch they are
grabbing where I am.

*Nowhere near* the numbers you had, but fun to watch/listen to - and
consistently there.
Yesterday the light was exquisite and the water like fluid glass. With
thousands of perch just under the surface.

Thanks for sharing.