The girls are in a covered secure run 4.5m x 1.8m x 2m high this is when we are out we do not let them free range any longer unless we are out with them, the attack did happen in an open area, we have an additional area of 10m x 5m which is just a 1m high fence attatched to the secure run but they started to fly over the top and therefore we allowed them to free range all the time, checking on them every hour or so, they were never left free ranging if there was no one around, the attack happened around 9.00am they had been out for approx 1hr, the four survivors were found in a small forest area at the end of the garden.
I understood that foxes killed and took away, there was no damage to head/neck just her back and left in an open area, I first spotted her from looking out the window and seeing her lying down, so the attack was not disturbed, as I said earlier it's not knowing for sure what it was, but hopefully they will not resent me not letting them have quite so much fun and freedom as they have had !
The thing is I am going to install an electric fence, however if it was a buzzard, then the rest of the girls would not have anywhere to escape to.