Why are they calling?

I woke up early in the morning and heard the big voice of crows calling and shouting loudly recently.
I wonder why they often cry and call in loud voice in the early morning like cock‐a‐doodle‐doo.
They say crows predict something unlucky or bad around here.
But I don't think so but they are getting to be arrogant and dominant against other birds around.
I can't hear sparrows and doves twittering any more.