Evidence suggests a Brown Bear (Ursus arctos) excavated a wolf (Canis lupus) den, then killed and ate four wolf pups that were inside.
CITATION STYLE
Hayes, R. D., & Baer, A. (1992). Brown Bear, Ursus arctos, preying upon Gray Wolf, Canis lupus, pups at a wolf den. The Canadian Field-Naturalist, 106(3), 381–382. https://doi.org/10.5962/p.356990
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