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Tonic Immobility

 Tonic Immobility

Tonic immobility is the ability of animals to enter a state of paralysis so that they can avoid a predator.
This is a natural behavior of animals in which they are temporarily paralyzed and unresponsive to external stimuli. The predator sees the paralyzed animal and though that he is dead. This can be called anti-predator behavior or animal hypnosis.
The animals who show tonic immobility, they play dead, and playing dead is called thanatosis

Animals who show tonic immobility

  • Sharks 
  • Rays
  • Opossum
  • Barred grass snake
  • Burmeister's leaf frog
  • Common swift (bird)
  • Green-head ant

Tonic Immobility in Humans

Humans also show tonic immobility in extreme conditions such as extreme fear, sexual assault, or disaster.
In any of these conditions, humans feel themselves becoming stiff, rigid, unable to move for some time or it can be throughout the trauma.

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