Wow, sounds like quite a sight! The only thing I can think of is European
Starlings. I've seen them performing similar aerial shows in film clips
from Europe. At times they fly together in beautiful shape-shifting
"clouds." I've seen them do it here as well, but never as spectacularly as
in the videos of them from their native continent. You might try looking
their flocking behavior up on Youtube. Good luck!

Best,
Alex Dickey

On Thu, Jan 5, 2012 at 3:31 PM, Anna Slack <[log in to unmask]> wrote:

> Hello Birders!
>
> As I was headed home on I-89 last night I noticed very large flocks of
> birds - or possibly one huge flock - trailing in a huge ribbon across the
> sky between the Dartmouth exit and heading on back toward the construction
> mess in West Lebanon.  Not being trained in such things I was curious to
> see if it would make mention on the listserv today - did anyone else
> experience this?  What were they?  It was quite impressive, it reminded me
> how entire caves of bats will fly in mass exodus into the night skies for
> feeding.  So much so, in fact, that I began to wonder if it was bats....or
> what could have possibly stirred up such a movement.
>
> Thanks for any info & please forgive if my terminology is not correct!
>
> Curiously,
>
> Anna Slack
>
> Programs Coordinator, UVLT
>