I have a small flock of mixed types of chickens. One of my original chickens was killed sometime this morning, she was smaller than the rest, but I have other small ones who are okay. This was my friendliest chicken and part of my original flock and has been with these other birds for 6 months why would they kill her now? I have lost two small silkies in the last two weeks. Is there something I can do? Seems like they kill a chicken when my husband or someone besides me feeds them. Any ideas would be appreciated.