I live on the second floor in a building close in to downtown Portland. Crows congregate in my neighborhood on trees, phone lines, and roof lines and then take off in a flock and fly downtown for their nightly gathering. I enjoy watching them gather and then take off. Sometimes the sky is swarming with crows heading for their nightly gossip sessions. I've also been downtown when they're arriving. It's quite dizzying watching them circle and find places to land. Fascinating!