Strange chicken behaviour?

[Rozanne]

Hi, I am a little confused, we have got 15 chickens half were astrolorps and the other half were mixed. We ended up with one chicken which was very small with feathers on it's legs. I heard a very stressed sound tonight coming from the chickens and I thought maybe a fox had got in. I ran down expecting the worst, instead I found all the big chickens at one side of the pen grouped together and the small one stood alone. Do they bully the smallest chicken in the group?

 

[ChickenLeg]

Could have, they could have gotten spooked by something then all hid and didnt want the little one to join them :/