I have 6 hens, 4 isa browns, 1 buff orpington, and 1 black sex link. They are approximately 15-16 weeks old. One of the isa browns seems to be antisocial? Whenever we free range them, they are always all together, except for that one hen. She goes off and finds bugs on her own. She's a little smaller then the rest, so I'm thinking this may be a pecking order thing. I don't see them physically bullying or pecking her though.. any thoughts on this?