Reassessment is Key

Note how six of the nine subspecies show Deficient Data.
Table 1 from Hansen, M. et al. 2021
Image Credit: IUCN Red List

Adapted from Hansen, M. F., Gill, M., Nawangsari, V. A., Sanchez, K. L., Cheyne, S. M., Nijman, V., & Fuentes, A. (2021). Conservation of Long-tailed Macaques: Implications of the Updated IUCN Status and the CoVID-19 PandemicPrimate Conservation35, 1-11.