Do crows have accents?

That may seem like a poor attempt at humor, but hear me out.  The crows in Ireland seem to sound different than the ones you find in the Great White North.  

In Ireland, their voices are softer, higher pitched.  In Canada, they are harsh, loud, and seem to be accusing us of forgetting.  Unlike Ireland, rich in history, mythology, and all the stories that go along with it, I find that we have cast aside the past in favor of progress.  

Are they screaming?  Using their harsh tone in an attempt to remind us?  Begging us to reconnect with the land and all who came before?