[Dinah Lord]

Very cool. FYI - it’s known as a “murmuration”.

Some additional info on the phenomenon can be found here:
http://tinyurl.com/56yvqe

Thanks for posting.

[FresnoRobert]

I saw a formation this large in the farmland of Central California near 5-Points driving south on Highway 145 last week. They turned the sky dark as they flew over my truck out of the orchards. It reminded me of the huge schools of fish you might see in the National Geographic TV specials, tens of thousands moving and bending in unison. Really a sight to remember.