What question did this study set out to answer?

To report the first observation of leucism in a bearded capuchin monkey.

February 11, 2026Open Access

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

TFTiago FalóticoUniversidade de São Paulo TVTatiane ValençaUniversidade de São Paulo

Key Points

To report the first observation of leucism in a bearded capuchin monkey.
Field observation at Ubajara National Park
Documentation of coloration and behavior
Comparison with known capuchin monkey characteristics
First documented case of leucism in Sapajus libidinosus
Highlights rarity of leucism in neotropical primates
Suggests need for long-term monitoring to understand such anomalies

Abstract

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.

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