We have breeding crows in our neighborhood here in Montana. Then in the winter, we have a large influx of wintering crows that have migrated down from Canada. They have a huge presence in town here, with groups hanging around in various places, and communal roosts. It seems that your Ithaca studies have been on a resident population of crows. I am curious about these crows that have migrated here for the winter - are they staying in family groups? Has anyone researched these migratory populations? I wonder about what kind of different strategies they have.