So I have heard that if you bring older birds into your current flock that the best way to do it is at night & to just place them in the coop with the others. I've also heard that it works because it's based on whether or not the new birds smell like the flock. So I'm wondering if it would help to change the pine shaving in the coop before I do it to keep the smell in there more neutral. Thoughts? TIA!