Helicopters, black or otherwise

There was a helicopter buzzing around early this afternoon, when I trudged down to the mailbox with some outgoing mail.

I just heard helicopter sounds again.

We don't usually have helicopters around here.

I don't see anything in the local news that might relate to helicopter activity out this way.

Anything particular going on, or just two helicopters happening to pass overhead in the same day?

Update:  An hour or so later, well after dark, there's that helicopter sound again.  Passing by, headed I know not whither.