The northern pig-tailed macaque is now treated as a species distinct from the southern pig-tailed macaque. A Thai comparison found differences between the northern and southern forms in crown hair, facial markings, coat, and tail.
A Thai survey reported differences between the northern and southern forms in crown hair, markings above the eyes, coat color, and tail length and carriage.
Near Satchari National Park in Bangladesh, researchers followed two macaque groups for a year. One used a forest–plantation mosaic; the other lived in a multicrop plantation without access to forest.
They collected 14,591 behavioral observations, recording where the macaques spent time and what they were doing. The groups provided a local comparison across landscapes with different connections to forest.
The plantation group spent more time on the ground. The group in the forest–plantation mosaic used the middle canopy more often and showed more play. Their activity records differed across the two settings. Observers spent 689 hours in the field over 53 days and recorded 7,804 and 6,787 scans for the two groups.
An extinction-risk assessment has not been added yet.
At Satchari, the forest–plantation group used the middle canopy more; the plantation group without forest access spent more time on the ground.