Pic doesn't do this event justice. Dark in color, profile looks like a very large version of chimney swift with more wing span than body length. Identified calls. This bunch was circling each other drifting northward but less than a minute later, followed by a smaller group that flew straight then started circle-drift, followed by 2 other smaller groups doing no circling. I'm guessing the stragglers the two largest groups were holding up for. Wow.
Latitude: 36.4 Longitude: -97.9
Observed by: Diane
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