Mallards Massing

Normally, when I pass the pond, the mallards set up a huge quacking but it’s nearly pitch black and I can’t see them.  I used to think that it was a warning call – and it might be – but more and more it seems as though they’re just plain ornery.  There’s commotion all the time, regardless of whether anyone is going by.  I peeked up over the weeds today and they started shifting around.  A few made some very peculiar vocalizations that made me look closely to see if there were other types of ducks there.  Nothing.  But they started to swim across the pond and to extra cover until I moved on.