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the claim

Only humans yawn.

the verdict
REFUTED
the evidence says no
Recorded sources
0 sources for · 6 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 only humans yawn?

No. A reference work states outright that not only humans yawn, and an encyclopedia entry notes that almost all vertebrates, including fish, birds and reptiles, yawn. Several studies also document yawning in bonobos, dogs and other primates.

Verdict: REFUTED · 0 sources for, 6 against · Last checked

Evidence against · 6
Yawn
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Yawn. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Yawn

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More against · 5
Yawn contagion in humans and bonobos: emotional affinity matters more than species
2014
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Yawn contagion in humans and bonobos: emotional affinity matters more than species. (2014). doi.org. https://doi.org/10.7717/peerj.519

Interspecific Contagious Yawning in Humans
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Interspecific Contagious Yawning in Humans. (n.d.). mdpi.com. https://www.mdpi.com/2076-2615/12/15/1908/pdf?version=1658907681

Chimpanzees show a developmental increase in susceptibility to contagious yawning: a test of the effect of ontogeny and emotional closeness on yawn contagion.
2013
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EA, M., T, P., S, S., S, L., & G, S. (2013). Chimpanzees show a developmental increase in susceptibility to contagious yawning: a test of the effect of ontogeny and emotional closeness on yawn contagion.. doi.org. https://doi.org/10.1371/journal.pone.0076266

Encyclopedia of animal behavior
2004
Get citation
Encyclopedia of animal behavior. (2004). archive.org. https://archive.org/details/encyclopediaofan0003unse

Social Modulation of Contagious Yawning in Wolves
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Social Modulation of Contagious Yawning in Wolves. (n.d.). doi.org. https://doi.org/10.1371/journal.pone.0105963

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