Publication Date


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First Advisor

King, Bethia H.

Degree Name

B.S. (Bachelor of Science)

Legacy Department

Department of Biological Sciences


Tonic immobility (TI), otherwise known as thanatosis or death-feigning, is a response in which an animal assumes an often death-like pose in the face of a predator or life threat (Teles et al. 2017). There are multiple amphibian species that exhibit tonic immobility, but there is not a single place in which all of their information is collected. The purpose of this project was to review and compare a wide collection of scientific reports on TI in different species of amphibians in order to create a library of knowledge to be a useful resource to future lab students and animal behaviorists. After finding 13 reputable sources using Web of Science, I found that 63 amphibian species of only frogs and toads have been found to exhibit TI. The most common TI posture involves a supine position with stiff legs, no additional anti-predator responses, and remaining in this position for ~101 seconds.


13 pages




Northern Illinois University

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