| Summary: | Morphism refer to polymorphic species, in which multiple colour variants coexist within a population. Morphism in pri- mates is common and langurs also exhibit certain character- istics of morphism, such as conspicuous natal coats. Banded langurs ( Presbytis femoralis ) and dusky leaf monkey ( Trachyp- ithecus obscurus ) exhibits the same characteristics of conspic- uous natal coats, but these coats are only limited to infants and changed when they reached adulthood. This article re- ports the first discovery of rare brown morph of two adult male banded langurs and one leucistic adult female dusky leaf monkey in Malaysia. We also conducted a systematic literature search to review the diversity of morphism in leaf monkey globally.
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