Chickens do not try to get up when placed on their backs due to tonic immobility
Research confirms that chickens can remain immobilized on their backs due to tonic immobility, an innate fear-induced response to manual restraint.
The claim states that chickens do not try to get up when placed on their backs due to tonic immobility. Papers like [4] and [7] explicitly describe standard testing methods where chickens are manually placed on their backs and exhibit tonic immobility (an innate motor inhibition/fear response) characterized by a temporary failure to right themselves. No papers contradict this premise; rather, tonic immobility is consistently treated as a well-established phenomenon in poultry science used to measure fear.
Inga Tiemann, Senta Becker, Jocelyn Fournier, Daalkhaijav Damiran, Wolfgang Büscher, Sonja Hillemacher. Differences among domestic chicken breeds in tonic immobility responses as a measure of fearfulness.. 2023. https://doi.org/10.7717/peerj.14703
The study describes testing tonic immobility by manually restraining chickens on their back and measuring the duration of the immobility response.
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D D Moriarty. Anxiogenic effects of a beta-carboline on tonic immobility and open field behavior in chickens (Gallus gallus).. 1995. https://doi.org/10.1016/0091-3057(95)00036-v
The study defines tonic immobility in chickens as an innate form of active motor inhibition displayed in response to physical restraint.
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