Plus, researchers could hear adult howler monkeys calling back and forth with the infants, who would sometimes try to crawl away. Camera footage showed one occasion when an adult howler came and tried to retrieve a baby, and capuchins scared it off.

Scientists discovered evidence that male capuchin monkeys have been "kidnapping" babies of a different species.

This photo provided by researchers shows a baby howler monkey clinging onto a young adult male capuchin monkey on Jicarón Island, Panama in September 2022. (Brendan Barrett/Max Planck Institute of Animal Behavior via AP) WASHINGTON (AP) — A baby howler monkey clung to the back of an older male monkey,