Tarsiers are probably the most advanced group of prosimians in relation to the higher primates.
They are quite small, rat sized primates that rarely exceed half a pound in weight. The name tarsier is derived from these bones. The tibia and fibula of the Tarsiers are fused in their lower portions, acting as a shock absorber. Considered a primitive trait normally seen in quadruped. Lower limbs are twice the length of its trunk.