I was free ranging the chickies today and heard a great squeaking noise. I looked up and saw hundreds of birds flying around in this huge ivy-covered tree in my yard. It was NUTS. They would all fly in together, and then more would come, and they would flap around in the leaves, doing who-knows-what, and then a great bunch would fly away and land in my neighbor's tree, which has no leaves, and once they left it looked like the tree was deserted, but then an even bigger bunch would fly away. Then they came back and repeated the process. Eventually they all ended up in my neighbor's tree. I mean it when I say HUNDREDS. I get songbirds but usually not this many. And not in winter. Now, after half an hour, they are ALL GONE. Weird, huh? They were black, but not making crow noises, and not that big. Blackbirds or starlings or grackels (sp?) , maybe.