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The number of Bornean orangutans has decreased by more than 60% in 60 years, and the population of the Sumatran orangutan has decreased by 80% in the last 75 years. [2] It is estimated that between 1999 and 2015, the population of Bornean orangutans has decreased by over 100,000. [2]
Millions of years ago, orangutans travelled from mainland Asia to Sumatra and then ... A 2016 study estimates a population of 14,613 Sumatran orangutans in the ...
They have a low reproductive rate, giving birth only once every 5-10 years, making it difficult to increase their numbers. However, the discovery of a previously unknown orangutan population in ...
An assessment of forest loss in the 1990s concluded that forests supporting at least 1,000 orangutans were lost each year within the Leuser Ecosystem alone. [1] As of 2017, approximately 82.5% of the Sumatran orangutan population was strictly confined to the northernmost tip of the island, in the Aceh Province.
The female gives birth to one infant every eight or nine years, so this isn’t a population that replenishes quickly. ... percent of the female Sumatran orangutan are killed every year due to ...
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]
Bornean Orangutan Population in the Wild Is 'Critically Endangered' According to The International Union for Conservation of Nature ... which "equates to a loss of more than 82% over 75 years ...
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]