The gaze of a social monkey is perceptible to conspecifics and predators but not prey
Whitham, W., Schapiro, S.J., Troscianko, J., & Yorzinski, J.L. 2022. The gaze of a social monkey is perceptible to conspecifics and predators but not prey. Proceedings of the Royal Society B: Biological Series 289: 20220194. PDF