A few nights ago I integrated my Silkie flock (2 roos & 3 hens) into my layer flock along with 3 Spitzhaubens and 5 mutts. They all free ranged together already and there wasn't a problem. Last night I caught a large RIR/BR hen attacking my silkies. She spent the night in my house as chew toy for my dogs. (No worries people, she survived). A while later we found Snowflake, our small white silkie, on her back in the run. There were a couple feathers taken out of her neck but no other damage. I put her in the brooder with the quail babies. She seemed to improve a little. My wife found her dead this morning. She must have had internal injuries or the shock killed her. My wife is very sad and buried her in our garden. Integration can be tough and I tend to do it very early and often. I also use it as an opportunity to eliminate the more aggressive birds. The hens on top of the pecking order never seem to bother them. It's only the low ranking birds who get vicious, especially the EE's and RIR/BR crosses.