It's probably not so much "shunning" going on as self isolation.
These two loners need to be carefully watched, though. A weak or sickly chick will often be pecked and bullied and then they self isolate out of self preservation. You need to figure out what's making these two chicks behave this way.
What are the ages of these chicks?
Are they as active as the others?
Do they seem wobbly on their feet?
Do they sleep more than the others?
Are these two eating as much as the others?
Do they seem to be cold, using the heat source more than the others?
They ended up accepting the lone Belgain chick and it was huddled up with them to sleep all last night. The lone Silkie chick ended up coming over to them but he just slept against them on the outside of their little pile and not actually in among them.
I have seen the biggest one peck at him, but it was mainly only when I first put them together, and I haven't seen anyone pecking him since. But they act like he isn't there. They walk all over him and just bump and push past him, which seems to be affecting his feeding, as he gets too knocked about to even eat much.
The Belgian chicks are all 2 weeks old, but the one that was abandoned does appear to be a bit smaller and less active. The friend who gave it to me, told me the mother had left it alone in the rain when a storm came, so that might explain if that one is a little unwell.
I think the bigger silkie is about 3 days old. I am not sure about the lone silkie, because the seller was suggesting I take a one day old one (it was closest to the colour I had been looking for), but I decided I liked the colour of a different one, but I forgot to ask its age ( I had assumed at the time it was one of the 3 day old ones, but now I am thinking it might actually be a one day).
The silkie sleeps a lot more than the others. I literally thought he died on the way home, because I opened the box and he was just a little still heap in the corner. But he perks up and runs around for a bit, before just sleeping again.
He is quite unsteady on his feet, but the others are also constantly knocking him over. I have seen him eating, but not as much as the others.
He also feels colder to touch than the others, but he doesn't really use the heat lamp which concerns me. I think it's because he stays away from the others who also like to sleep under the heat lamp. Last night I found him sleeping in the food bowl while the others slept under the heat.
Should I just leave him with them and keep a closer eye, or separate him for a bit until he's a bit older?
I've raised several chicks before, but I've never experienced this situation.