SOLUTION: Space is one of the keys to happy, healthy chickens. The bare minimum space requirements are four square feet per bird in the coop and ten square feet per bird in the run. If chickens will be confined primarily to the coop and run daily, a much greater space allowance must be made to avoid feather picking and boredom.
Awesome Chicken Chart shows which breeds can/can't tolerate confinement (backyards chickens) and which breeds are best/worst for free-range. Plus lots of other helpful info for choosing the right breeds for you.
The various chemicals used in beekeeping have, for the past decades, held Varroa Destructor, a mite, and other major pests at bay, but chemical-resistance is building and evolution threatens to overtake the best that laboratory chemists have to offer. In fact, there is evidence that chemical treatments are making the problem worse. Natural Beekeeping flips the script on traditional approaches by proposing a program of selective breeding and natural hive management.