The internet is worried about Punch the monkey. The zoo says he's OK.

A viral video sparked panic online, but the Ichikawa City Zoo says that's just normal monkey business.
The New York Times

This Was Odd: These Monkeys Kidnapped Babies From Another Species.

Male capuchin monkeys on a Panamanian island were documented carrying around infant howler monkeys for no clearly discernible reason. By Elizabeth Landau Capuchin monkeys don’t generally hang ...
insider.si.edu

Howler monkeys. Behavior, ecology and conservation / Martín M. Kowalewski, Paul A. Garber, Liliana Cortés-Ortiz, Bernardo Urbani, Dionisios Youlatos, editors

Part I. Introduction. 1. Why is it important to continue studying the behavioral ecology and conservation management of howler monkeys? / Martín M. Kowalewski, Paul A. Garber, Liliana Cortés-Ortiz, ...
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The surprising truth behind monkeys’ mischievous reputation

From a quick swipe of a banana to elaborate “ransoms” of smartphones, monkey shenanigans have earned these adorable animals a worldwide reputation as mischievous little thieves. Perhaps you’ve seen ...