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Researchers in Panama have observed a disturbing trend among young male white-faced capuchin monkeys on Jicarón Island. These monkeys are kidnapping howler monkey infants, seemingly for amusement, a behavior initiated by a monkey nicknamed "Joker." This trend, documented via camera footage, has spread to other young males, resulting in the deaths of several howler infants due to dehydration and malnutrition. The researchers suggest that boredom and a lack of predators on the island might contribute to this unusual behavior, highlighting the capuchins' capacity for cultural learning and innovation, even if the actions lack obvious benefit. The impact on the howler monkey population is a concern.

Prepared by Olivia Bennett and reviewed by editorial team.