The order Primates contains humans and their closest relatives&colon; lemurs, lorisoids, tarsiers, monkeys, and apes. The divergence between strepsirrhines, simians, and tarsiers likely followed almost immediately after primates first evolved. Soon after, the lorises and tarsiers made the same journey. Prosimii included all of the prosimians&colon; Strepsirrhini plus the tarsiers. However, some mammals have lost the ability to synthesize vitamin C, notably simians and tarsiers. The simians are sister to the tarsiers, together forming the haplorhines. Simians and tarsiers emerged within haplorrhines some 60 million years ago. The latter was closely related to tarsiers, monkeys, and apes. Most species are diurnal (the exceptions being the tarsiers and the night monkeys). All lemuriforms have a VNO, as do tarsiers and some New World monkeys. The western tarsiers, the Philippine tarsiers, and the Sulawesi tarsiers. Displays by private people in Loboc, Bohol tend to diminish the lives of tarsiers. This differs from tarsiers, which lack a tapetum lucidum but possess a fovea. As predators, Philippine tarsiers may help to structure insect communities. Tarsiers do not do well in captivity.