Observation reveals that cactus wrens engage in egg predation of house finches, suggesting a potential feeding behavior change.
Although the Cactus Wren (Campylorhynchus brunneicapillus), like some other wrens, is well known for destroying other birds’ eggs, it has not been reported eating those eggs. We observed an incident of a Cactus Wren consuming the contents of an egg it took from a House Finch (Haemorhous mexicanus) nest ~25 km southeast of La Paz, Baja California Sur, Mexico.
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Marrón et al. (2025) studied this question.
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