So my idea was to plant a muscadine vine on a trellis near part of the run. This would provide a source of shade and a source of treats. Are muscadines poisonous? Or, do chickens gorge themselves? Would they end up eating so much that they'd explode? Like if you feed a fish too much fish food it will get impacted and die. Does this happen to chickens, or do they overall know when to stop eating?