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 [email protected] -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/EC392C88-BC62-4054-869F-C47433CA47B0%40gmail.com.
