There’s probably a good chance you have never wondered this in your life. But now that I’ve asked this, aren’t you kinda curious?
In North America, only the crow and the raven are completely black. Many people would refer to them as common “trash birds”, a title which I find equally hilarious and unfair. Here is a cool pdf for you, if you are just as appreciative of common birds as I am.
Aside from all the myths surrounding this highly intelligent bird, the truest answer to why it is black is that nobody knows for sure. However, we can speculate that it helps them quickly identify others of their kind, since it doesn’t seem to do much else.
Take a look at this African white-necked raven. They have some parroting abilities!