If you’re trying to figure out if it’s a crow or a raven, remember that smaller bird=smaller word, so crows are the little guys. If you’re wondering, huh, is that big enough to be a raven? It’s a crow. Ravens are startlingly large if you’re used to crows. Ravens are real big. Ravens are hawk sized. Ravens are bigger than your head.
Here’s a size comparison.
and here is a crow with a human
versus a raven
So if there is any doubt that that croaky black bird is big enough to be a raven, it’s probably a crow.