A couple of things to consider is the weather. Birds of Prey will be more desperate for food during the winter and just before or after a big storm since they are unable to hunt in driving rain. The longer the bad weather, the more likely they are to be desperate for food. Also late winter, they begin sitting on their nests which means that they are hunting for two birds. A hungry bird will take more risks. We try to provide ample of natural prey for them so they are less likely to hit the chickens. Providing spaces for rabbits to hide encourages natural prey. In the city, even setting up a wild bird feeder (away from your coop) means that they have other prey. (So buy the next door neighbor a bird feeder for a gift
. Late in the summer your young hatchlings are beginning to hunt for their own and they can be very inexperienced. (Good news for you most of the time but sometimes they can be stupid too).
When the weather first clears I will try to be a bit late letting the girls out and more likely to keep an eye on them.

When the weather first clears I will try to be a bit late letting the girls out and more likely to keep an eye on them.