Certain species of frogs can change their biological sex

the verdict

SUPPORTED

the evidence backs this

Recorded sources

3 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that certain species of frogs can change their biological sex?

Yes. Multiple scientific studies confirm that certain frog species can undergo biological sex reversal, where individuals develop a phenotypic sex opposite to their genetic sex due to environmental and natural factors.

Verdict: SUPPORTED · 3 sources for, 0 against · Last checked 6 Aug 2026

The analysis

The retrieved papers include direct empirical evidence of natural and environmentally induced sex reversal in frog species (such as green frogs and agile frogs), as well as comprehensive databases cataloging amphibian sex reversal. Therefore, the claim is supported by the evidence.

Evidence for · 3

Molecular evidence for sex reversal in wild populations of green frogs (Rana clamitans)

2019

This study provides molecular evidence for natural sex reversal (changing phenotypic sex opposite to genotypic sex) in wild populations of green frogs (Rana clamitans).

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Lambert, M., Tran, T., Kilian, A., Ezaz, T., & Skelly, D. (2019). Molecular evidence for sex reversal in wild populations of green frogs (Rana clamitans). doi.org. https://doi.org/10.7717/peerj.6449

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More for · 2

HerpSexDet: the herpetological database of sex determination and sex reversal.

2023

The HerpSexDet database compiles empirical data on herpetological sex determination and documents reports of sex reversal across numerous amphibian species.

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E, N. & V, B. (2023). HerpSexDet: the herpetological database of sex determination and sex reversal.. doi.org. https://doi.org/10.1038/s41597-023-02268-y

Higher Sex‐Reversal Rate of Urban Frogs in a Common‐Garden Experiment Suggests Adaptive Microevolution

2025

This common-garden experiment demonstrates that agile frogs (Rana dalmatina) can undergo sex reversal in response to environmental conditions such as larval heat stress.

Get citation

Bókony, V., Balogh, E., Mikó, Z., Kásler, A., Örkényi, Z., & Ujhegyi, N. (2025). Higher Sex‐Reversal Rate of Urban Frogs in a Common‐Garden Experiment Suggests Adaptive Microevolution. doi.org. https://doi.org/10.1111/eva.70093

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What does the evidence say?

Receipt History

first checked06 Aug 2026

judged → SUPPORTED · 8506 Aug 2026

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