Large Blackbird Flock, N Boulder, 10/8, 7:40am

[Thomas Heinrich]

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
Nyc...@aol.com