I found this page after losing a Rhode Island Red (About 6 lbs), I went to lunch on Monday after feeding the hens. When I got home about 2 hours later, I found Nugget laying on the ground, without her head or neck... it was completely gone, there were no tracks in the snow indicating any ground predators, and it would be hard for any ground predators to get into my chicken pen anyways. So, I learned that a hawk probably killed her and cut off her head at the neck and carried it to it's nest. As I've been reading, I've learned that hawks are afraid of Crows and people who have black hens like Australorps don't seem to have their chickens bothered. I have a black sex-link and a black Jersey Giant, but I'm guessing Nugget was out pecking at the feed without her sisters and was an easy target. I've hung a couple CDs over the chicken coop to blow in the wind as a deterrent to the hawks. I have an Owl decoy with a movable head to put out on a post in the spring. The ground is too frozen right now to put in the post.
As I was reading, one thing that stood out to me was other people losing Rhode Island Reds and Buff Orpingtons... I was wondering if some breeds are seen as food more often than others. Does anyone keep track of which breeds of chicken are most often attacked by hawks? Are black colored hens the safest?