I think your hens will learn to be vigilant. Do they have hiding places while they're free ranging? I would let them range, but that's just me. Again, it's a decision that only you can make. Do you have a dog that's out with your birds? We have hawks, owls, and eagles where I live. Of all the losses I've had over the years, I haven't lost any to a hawk (or eagle, as far as I know). We do live in a very rural area, though, and there are lots of pheasants, rabbits, and other small wildlife around. I think that makes a huge difference. The hawks would rather get their food away from the buildings if possible. We also have a black lab that hangs out around the chickens, and he may be a deterrent, too. That's my theory, anyway. I'm so glad your son wasn't too upset. You're right - kids are resilient when given the chance. I also think your handling it in a matter of fact way makes a difference. If you were to have treated it like a tragedy, he would most likely have been more upset by it.
