Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to add new chickens to a flock [title] Quarantine your new chickens away from the old flock for several weeks, and watch them carefully for any signs of sickness. [step] The new chickens should not share the same ground or air as the old flock. Wash your hands and clean the bottom of your boots after you interact with the new flock to avoid inadvertently transmitting illnesses.

Ending1: [title] Purchase an incubator for your new chickens. [step] You will need an incubator that is 22 x 24 " x 24 ". Ending2: Even if you know you need the new chickens, any infection or illness will be the result of your farming practices. If anyone attempts to sell your new chickens, medically or otherwise, inform the locals and the authorities immediately. Ending3: [substeps] You may (or may not) spread germs, parasites, and other pathogens by going through your flock and sharing dirt and waste at the same time. Other stains and odors may change during quarantine. Ending4: [title] Make sure the new chickens are of the same size as the old flock. [title] Ensure adequate room in the coop or pen to reduce the chance of bad habits that come from over crowding.

Answer format: ending1/ending2/ending3/ending4