I live in Southeastern New Hampshire and we see crows mostly in the fall - Oct-Nov. I have never seen them roost but I know they must. During the day they alight near bird feeders and a pond and never stay long. I have never seen them eat seeds from the feeder - even if the seeds landed on the nearby ground. At the same time, there is also another flock a football field size away in the middle of a grassy hilly field. The two groups always appear to be talking to and working with each other.