With OpenMonkeyStudio, we compare 2D and 3D representations in macaques (Bala et al., 2020). We compared our systems’ ability to recognize semantic actions (standing, walking, climbing, climbing supine, sitting, and jumping). A. The poses are clustered by using UMAP. Each cluster is correlated with specific actions. B. With the clusters, we recognize actions using the k nearest neighbor search and visualize the transitions between actions. C. In contrast, the 2D representation provides the clusters that are driven by the pose and viewpoint.