Beekissed, I disagree with your philosophy regarding hens killed by hawks as being less than desirable. They won't be available to carry their genes forward, in most cases, only because of bad luck on their part. They were most likely as intelligent and vigilant as the rest ?
In my case the primary hawk of concern is the Goshawk. They do not normally circle over head and then drop on their prey. They know the area well, and they come in low and extremely fast. Their prey does not have a chance to escape, unless they are large enough to physically fight the hawk. That would perhaps be a bird the size of a Brahma rooster. An adult female Goshawk is a large bird with large razor sharp talons.
In my case the primary hawk of concern is the Goshawk. They do not normally circle over head and then drop on their prey. They know the area well, and they come in low and extremely fast. Their prey does not have a chance to escape, unless they are large enough to physically fight the hawk. That would perhaps be a bird the size of a Brahma rooster. An adult female Goshawk is a large bird with large razor sharp talons.