Thursday, 3 October 2013

[cobirds] Common Grackles roosting in Sombrero Marsh, Boulder county

COBirders,
I made a brief stop at Sombrero Marsh/Pond this evening at 6:00 (Marsh Wren is now my nemesis BOCO bird...) What I found instead was a large flock of Common Grackles - probably 500+ - roosting in the reeds on the far side of the pond and in a few of the surrounding trees. As I scanned the pond, I noticed a stream of grackles descending into the reeds that turned out to be the head of a flock of at least 1,000 that extended as far as I could see. An impressive if not unprecedented sight.

It will be interesting to hear what tomorrow's cold front has in store for us bird-wise. Perhaps we'll see a bigger push of finches and other higher-elevation species drop down? Or maybe a decent passerine flight??

Peter Burke

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