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Apparent death
Apparent death, colloquially known as playing dead, feigning death, or playing possum, is a behavior in which an animal takes on the appearance of being dead. This form of animal deception is an adaptive behavior also known as tonic immobility or thanatosis. Apparent death can be used as a defense mechanism or as a form of aggressive mimicry, and occurs in a wide range of animals.
When induced by humans, the state is sometimes colloquially known as animal hypnosis. According to Gilman et al.,〔Gilman, T.T., Marcuse, F.L. and Moore, A.U., (1960). Animal hypnosis: a study of the induction of tonic immobility in chickens. Journal of Comparative Physiology and Psychology, 43: 99-111〕 the investigation of "animal hypnosis" dates back to the year 1646 in a report by Athanasius Kircher.
==Etymology==
The term "thanatopsis" (Greek: thanatos "death" + opsis "a sight, view") may be more correct than "thanatosis" which simply refers to death. The addition of the term "-opsis" lends the meaning that the animal only appears to be dead but is in fact alive.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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