Raven: Curious...The voice is normally a distinctive deep, harsh croak, or hollow croaking honk. Ravens have a large, complex vocabulary of sounds in their repertoire including a high knocking "toc toc toc", a dry, grating "Kraa", low guttural rattles, and some more musical calls. Captive birds have even been taught to speak.
According to legend, when someone finds a black feather, it means that the guardian of their soul is near them. The feathers are supposed to remind the individual that he or she is not fighting the battles of life alone. - Black Raven Feather