The robins descended upon a row of holly trees, as they tend to do every morning. They showed the same behaviour I've seen before--a few fly into the tree, crash around noisily, knocking a lot of berries to the ground (which they don't seem to go down to pick up), and then fly into a nearby birch and ruminate for a while as others take their places in the hollies.
This is the craziest tree in the neighbourhood, some sort of cherry I think. It's like a web spun by a spider dosed with caffeine. It too looks improved with a dusting of snow.