 Black-shanked doucs preferentially utilise evergreen forest, where they maintain the largest group sizes and highest relative densities compared to those in other habitat types.They are also commonly found in semi-evergreen and mixed deciduous forest, although occurrence in this latter type may be sub-optimal due to limited food resources, and can be found in dry deciduous dipterocarp forest but likely only where there are patches of the preferred forest types.Group sizes depend on habitat suitability, and are smaller in sub-optimal habitats.