# First observation of a leucistic bearded capuchin monkey (Sapajus libidinosus)

## TL;DR

Scientists observed a rare leucistic bearded capuchin monkey in Brazil, adding to the limited knowledge of pigmentation disorders in neotropical primates.

## Contribution

This is the first documented case of leucism in the species Sapajus libidinosus.

## Key findings

- A leucistic bearded capuchin monkey was observed at Ubajara National Park, Brazil.
- The observation adds to the limited understanding of leucism in New World monkeys.

## Abstract

Leucism, a pigmentation disorder resulting in partial loss of coloration, is rare in neotropical primates. This manuscript presents the first report of a leucistic robust capuchin monkey (Sapajus libidinosus), observed at Ubajara National Park, Brazil. Our findings contribute to the sparse literature on leucism in New World monkeys, emphasizing the importance of long-term studies for monitoring such rare anomalies.

The online version contains supplementary material available at 10.1007/s10329-026-01243-6.