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Over the past 60 years, the population of all three species has been steeply declining. [2] The current population of orangutans cannot be accurately calculated; however, it is estimated that the number of individuals remaining is: 104,000 Bornean orangutans, 14,000 Sumatran orangutans, and 800 Tapanuli orangutans. [3]
They were shocked to find up to 200 members of the most severely threatened population of Bornean orangutans. The sub-species Pongo pygmaeus pygmaeus has only around 3,000-4,500 animals left in ...
Scientists believe there are nine existing populations of the orangutans within Sumatra, but only seven are viable long-term, meaning they have more than 250 individuals. Three populations have ...
"Bornean Orangutans decreased by more than 60% between 1950 and 2010, and a further 22% decline is projected to occur between 2010 and 2025," the organization explains, which "equates to a loss of ...
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]
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]
In 2016, when the International Union for Conservation of Nature listed Borenan orangutans as a critically endangered species, the organization noted the animal's population was on the decline.The ...