I started an experiment
So ... are you going to get more chickens to continue your experiment?
Get more chickens when you have a new coop for them?
What is your plan for the future?
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A coyote or fox could easily carry them away whole with very little feathers left, just cart them off to their den to feed their new babies ...
People could have carted them off to give the poor chickens a proper home, or ... just ate them!