We have never had chickens before. We have 20 babies together. They are 4 or 5 weeks old. We purchased them form our local TSC. Several of them have blood around their tail feathers and are peeking around on the bloody areas. What's going on? Do we have to many together? Is this just normal as they start getting their feathers? Should we seperate out the ones with blood? Don't know what to do.......