Here in Golden on this snowy morning I've heard and seen several flocks of mainly Mountain Bluebirds flying overhead.
One massive flock of 150+ birds, which alighted in the trees across from my yard, was mixed Mountain/Western (70/30).
The huge flock departed south, downhill, towards downtown Golden so be on the lookout!
The usual bushtits, both Chickadees and Downy Woodpeckers all enjoying the feeder.
Cheers!
Tim Mitzen
Golden