Monday, 16 July 2018

[cobirds] Large flock of Common Nighthawks, Lyons, Boulder County

At 735p this evening I heard nighthawks from our yard.  A flock of about 45 was circling n a late thermal.  After slowly climbing and drifting, the entire flock departed, not in anything even vaguely resembling a formation, towards the west-northwest until I lost sight of them.

Rolf Hertenstein, Lyons, Boulder County

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