A huge mixed flock of blackbirds just moved south through the neighborhood of Newlands N Boulder, spending 5-10 min in treetops close to my house. The vast majority was Common Grackles, though there were at least some Red-winged Blackbirds and European Starlings as well. From what I was able to see, I estimated in the low thousands (2-3k), but there could have been substantially more as my view was obstructed by trees.
This is by far the largest flock I have seen in the neighborhood. I wonder if its presence had anything to do with very thick layer of wildfire smoke in the valley.
Thomas Heinrich
Boulder, CO
Nyctea@aol.com
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