Primate Problem: Scientists have documented a bizarre new primate behavior — capuchin monkeys are kidnapping baby howler monkeys and carrying them off for days. With over 11 babies kidnapped over 15 months, scientists think the behavior likely emerged from boredom, as capuchins live in a predator-free environment. The trend started from a single misbehaving monkey, representing the first documented case of animals developing a destructive cultural fad, paralleling human social media trends.
https://www.nytimes.com/2025/05/19/science/capuchin-monkeys-kidnapping-abduction.html