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the claim

All mammals have hair at some life stage.

the verdict
CONTESTED PARTIAL
Recorded sources
2 sources for · 1 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 all mammals have hair at some life stage?

Partly. One reference work lists hair as a defining feature of mammals, and a research summary notes that some mammals are hairless, but neither source addresses whether every mammal has hair at some life stage.

Verdict: CONTESTED PARTIAL · 2 sources for, 1 against · Last checked

Evidence for · 2
Why do mammals have fur? : and other questions about evolution and classification
2014
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author, J. P. (2014). Why do mammals have fur? : and other questions about evolution and classification. archive.org. https://archive.org/details/whydomammalshave0000jaco

Evidence against · 1
How (some) mammals lost their hair
2022
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Dean, M. D. (2022). How (some) mammals lost their hair. doi.org. https://doi.org/10.7554/elife.84865

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More for · 1
Wikibooks: Science: An Elementary Teacher’s Guide/Animals
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Wikibooks: Science: An Elementary Teacher’s Guide/Animals. (n.d.). en.wikibooks.org. https://en.wikibooks.org/wiki/Science:_An_Elementary_Teacher’s_Guide/Animals

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held for human review18 Oct 2026
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