Although tarsiers do not appear to be rare in many areas, they are very sensitive to changes in their environment. For example, Merker found the population density of Dian's tarsier to be 268 individuals per 0.04 mi2 (1 km2) in undisturbed primary forest, 130-190 in slightly or medium disturbed areas, and 45 in plantations outside natural forest. Neri-Arboleda found 16 males and 41 females of the Philippine tarsier per 0.04 mi2 (1 km2), mainly in early mid-succession forest. All authors agree that rapid habitat destruction is the major threat to the tarsiers. The spectral tarsier is listed by the IUCN as
Lower Risk/Near Threatened; Dian's tarsier as Lower Risk/Conservation Dependent; and the Philippine, pygmy, western, and Sangihe tarsiers are listed as Data Deficient.
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