Tonic immobility
- Pronunciation
- /TON-ik im-MOB-il-ih-tee/
- Category
- Behavior
- Singular
- Tonic immobility
- Plural
- Tonic immobilities
Definition
A natural state of paralysis that some animals enter, usually in response to a threat. In insects and arachnids, it is often a defense mechanism to avoid predation.
Etymology
From 'tonic', relating to muscle tone or tension, and 'immobility', meaning the state of being immobile or motionless.
Example
When threatened, a mantis might enter a state of tonic immobility to avoid detection by predators.
Synonyms
- Catalepsy
- Death-feigning
Related Terms
- Defense mechanism
- Thanatosis
- Predation
Usage Notes
Tonic immobility is distinct from other forms of paralysis as it is a reversible and voluntary response to threat, often observed in both terrestrial and aquatic animals.