The scientific name for this is tonic immobility and is something some animals do if they think they are about to die, as a last ditch effort to avoid danger. Possums famously do this when they get scared.
One theory about the line method in particular is that the chicken thinks it sees a snake, though this isn’t proven. And there are other methods of getting a chicken to enter a “hypnotized state” including tucking its head under its wing as though it’s sleeping
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