Beverly
Nothing,the crows are communicating with each other, perhaps an alarm call because of a predator like a Hawk, Eagle or another crow. It could be feeding time, a nearby nest, not sure. don't read to much into this, just birds. It's not the Walking Man!
The First Dragon
Crows go around in flocks, so they caw a lot to give each other the news. They are really smart.
Anonymous
It's actually Randall Flagg keeping an eye on you.
TB12
It means there are a lot of crows in your area.
Seriously, it means nothing,,, now when one lands on your shoulder, looks you in the eye and caws,,, then you might be on to something.
keerok
There are crows nearby.