Slight lateral compression. Strong orbital ridges. Legs and toes are long, heavily clawed for climbing trees. Mouth is quite large, and quite capable of inflicting a painful bite in the bigger species. All are slightly laterally compressed with strong bony ridges on face running from the rostrum, back between the eyes to the back of the head.
Males have dewlaps.
Densely foliaged mountain jungles. Usually found on the ground or only a short distance above the ground in low bushes. Require a cool dense rainforest set-up with access to water. Live high in the trees in the dense tropical and montane rainforests. Occasionally found on the ground in the undergrowth but prefer height.