Ya, and what is a large group of ravens/crows called? I am pretty sure it's called a Murder.
When we lived in New Hampshire and we would walk home at night. THOUSANDS (there had to be like 2-3 thousand) crows would follow us
it was really creepy.
I had never seen that many before and when I looked at the trees I was wondering about the "strange black leaves" until one flew off, and the rest followed!
One night an owl attacked a raven. Bad move, the entire group went after the owl! But still, creepy enough, a few hundred stayed and followed us to our apartment building.
Very smart birds, just watch out and keep anything shiny away from them.