I lost a rooster last year to a red-tailed hawk. I had to replenish my flock anyway, so I got some Black Australorps. I am very pleased with the fact that they do indeed look like a nice flock of big, black crows. And I have not seen or heard a hawk since they got old enough to hang out outside.
After the hawk attack in which one of my two good roos was taken, I kept my chickens confined in a small run that a hawk can't get into, for 4-5 days. Hawks are opportunistic hunters. He came back the next day, and the day after. But the groceries were not readily available, so he went hunting elsewhere, looking for easier pickings.
I also made shelters for my birds. Hidey-holes they can duck under quickly if they see danger in the skies. I haven't lost another bird since then.
I guess I am one of those bleeding-heart hippies that believes we can live in harmony with nature, it just takes some planning. Good luck!