Effective intergroup communication is crucial for not just the health but the very survival of a species. Pied tamarins resort to various scent markings, each serving different purposes, such as conveying territorial or reproductive information.

The study’s compelling findings revealed a direct correlation between the escalation in noise decibel levels and the frequency of scent markings. This indicates that as their vocal communication gets muffled amidst the urban noise, these primates are relying more heavily on scent markings.

— Read more in Monkeys use more scent markings to combat human noise pollution at Earth.com.