1. Squirrels and chipmunks take the majority of nestlings in the Northeast. Crows are near the bottom of the list of baby bird predators.
2. The best sighting of American Crows was with a Mass Audubon group on a cold night in February in a hospital parking lot in Springfield, MA. The crows were flying in from staging areas to roost at the edges of the parking lot where the lights gave them protection from owls. There were an estimated 7,000-10,000 crows, and I have never heard or seen anything like it!
3. There are both crows and ravens where I live in Western Massachusetts. The biggest difference I notice is the tendency for ravens to be more solitary. I rarely see them in large flocks like I do the crows.
4. Crows help to keep the insect and rodent population down, provide nests for great horned owls and merlins, are themselves prey for other animals, and help disperse seeds.