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the claim

Bears are nocturnal.

the verdict
CONTESTED PARTIAL
Recorded sources
5 sources for · 5 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 bears are nocturnal?

Partly. The sources only partially address the claim: some describe particular bear species or populations (spectacled, Asiatic black, European brown bears) as nocturnal, while others report brown, grizzly and black bears as primarily diurnal or nocturnal only seasonally or where humans are present. No source establishes that bears as a whole are nocturnal.

Verdict: CONTESTED PARTIAL · 5 sources for, 5 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 5
Wild about bears
2014
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Jeannie, B. (2014). Wild about bears. archive.org. https://archive.org/details/wildaboutbears0000bret

Evidence against · 5
Nocturnal and diurnal foraging behaviour of brown bears ( Ursus arctos ) on a salmon stream in coastal British Columbia
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Nocturnal and diurnal foraging behaviour of brown bears ( Ursus arctos ) on a salmon stream in coastal British Columbia. (n.d.). cir.nii.ac.jp. https://doi.org/10.1139/z02-123

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More for · 4
Spectacled bears
2016
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author, G. T. (2016). Spectacled bears. archive.org. https://archive.org/details/spectacledbears0000gagn_e9u7

Activity patterns of brown bears ( Ursus arctos ) in Slovenia and Croatia
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Activity patterns of brown bears ( Ursus arctos ) in Slovenia and Croatia. (n.d.). cir.nii.ac.jp. https://doi.org/10.1111/j.1469-7998.2006.00114.x

Applying a Random Encounter Model to Estimate the Asiatic Black Bear ( Ursus thibetanus ) Density from Camera Traps in the Hindu Raj Mountains, Pakistan
2024
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Ahmad, F., Mori, T., Rehan, M., Bosso, L., & Kabir, M. (2024). Applying a Random Encounter Model to Estimate the Asiatic Black Bear ( Ursus thibetanus ) Density from Camera Traps in the Hindu Raj Mountains, Pakistan. doi.org. https://doi.org/10.3390/biology13050341

Brown Bear and Human Recreational Use of Trails in Anchorage, Alaska
2017
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Coltrane, J. A. & Sinnott, R. (2017). Brown Bear and Human Recreational Use of Trails in Anchorage, Alaska. doi.org. https://doi.org/10.26077/wzyf-zz97

More against · 4
Camera trap evidence of the cathemeral behavior of Andean bears
2026
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Heinz, P., Daniel, R., & J., S. F. (2026). Camera trap evidence of the cathemeral behavior of Andean bears. zenodo.org. https://doi.org/10.5281/zenodo.19964656

Data from: Behavioral responses of black bears to human presence and infrastructure in Yosemite National Park
2026
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Data from: Behavioral responses of black bears to human presence and infrastructure in Yosemite National Park. (2026). doi.org. https://doi.org/10.5683/SP4/Q97L23

Effect of Season and High Ambient Temperature on Activity Levels and Patterns of Grizzly Bears ( Ursus arctos )
2015
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McLellan, M. L. & McLellan, B. N. (2015). Effect of Season and High Ambient Temperature on Activity Levels and Patterns of Grizzly Bears ( Ursus arctos ). doi.org. https://doi.org/10.1371/journal.pone.0117734

Human recreation impacts seasonal activity and occupancy of American black bears (Ursus americanus) across the anthropogenic-wildland interface
2022
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Hubbard, T., Cove, M. V., & Lafferty, D. J. R. (2022). Human recreation impacts seasonal activity and occupancy of American black bears (Ursus americanus) across the anthropogenic-wildland interface. doi.org. https://doi.org/10.1038/s41598-022-15665-x

Receipt History
held for human review18 Oct 2026
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