After having read a few books with themes of witchcraft in them (ie. Terry Pratchett's *Carpe Jugulum*), I have come to want to use some of the symbolism found in those books in my own writing.

What I really would like to use is the symbolism behind a specific number of crows—allegedly it would foreshadow an event or something of the sort. However there are many variants, and I was wondering what the most common ones were.