Although crows and ravens are part of the same family called Corvus, they’re not exactly the same bird. Typically, ravens are quite a bit bigger than crows, and they tend to be a bit shaggier looking. Both crows and ravens have appeared in a number of different mythologies throughout the ages. In some cases these black-feathered birds are considered an omen of bad tidings, but in others they may represent a message from the Divine.
In Celtic mythology, the warrior goddess known as the Morrighan is often seen accompanied by a group of birds, or appears in the form of a crow or raven. The Native Americans usually, but not always, considered the raven as a trickster, much like Coyote, and in the legends causes mischief and are seen as a symbol of transformation. Some tribes knew the raven as a stealer of souls.