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A 2016 study estimates a population of 14,613 Sumatran orangutans in the wild, twice that of previous population estimates, [131] while 2016 estimates suggest 104,700 Bornean orangutans exist in the wild. [119]
The rate of deforestation during this time directly correlates with the decrease in orangutan population, as the species cannot survive in other areas. It is estimated that since 1950, the orangutan population has declined by 60%. [24] Between 1999 and 2015, the population of Bornean orangutans decreased by 100,000 individuals. [2]
Sumatran orangutan (Pongo abelli) Hominoidea is a superfamily of primates. Members of this superfamily are called hominoids or apes, and include gorillas, chimpanzees, orangutans, gibbons, bonobos, and humans. Hominoidea is one of the six major groups in the order Primates. The majority are found in forests in Southeastern Asia and Equatorial Africa, with the exception of humans, which have ...
Until well into the 19th century, juvenile orangutans were taken from the wild and died within short order, eventually leading naturalists to mistakenly assume that the living specimens they briefly encountered and skeletons of adult orangutans were entirely different species. [5]
This population currently numbers around 70 individuals and is reproducing. [1] However it has been concluded that forest conservation costs twelve times less than reintroducing orangutans into the wild, and conserves more biological diversity. [36] Orangutans have large home ranges and low population densities, which complicates conservation ...
An orangutan peeling a banana with its hand and foot. The Bornean orangutan diet is composed of over 400 types of food, including wild figs, durians (Durio zibethinus and D. graveolens), [29] leaves, seeds, bird eggs, flowers, sap, vines, [30] honey, fungi, spider webs, [30] insects, and, to a lesser extent than the Sumatran orangutan, bark.
An isolated population of orangutans in the Batang Toru area of South Tapanuli was reported in 1939. [6] The population was rediscovered by an expedition to the area in 1997, [7] but it was not recognized as a distinct species then. [8] Pongo tapanuliensis was identified as a distinct species, following a detailed phylogenetic study in 2017.
The total number of Bornean orangutans is estimated to be less than 20 percent of what it was 50 years ago (from a population of about 288,500 in 1973 [7] to a population of about 57,350 in 2016 [9]) and this sharp decline has occurred mostly over the past few decades due to human activities and development. [10]