Oh, gnu, that must've been an incredible site! We have lots and lots of ravens, here, but they don't do much en masse. We do get geese travelling here from the north and/or to parts further south. The smaller birds have come back to twitter in the neighbour's evergreens, so it's time to start putting out the seeds. We spread it on a table outside the living room window and put some in feeders. Makes great cat TV!