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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]
Their numbers have decreased by more than half over the last 60 years. Exact population counts are difficult to ascertain, but the World Wildlife Fund estimates there are only 120,000 orangutans ...
Mirror tests with a 2-year-old orangutan failed to reveal self-recognition. ... A 2016 study estimates a population of 14,613 Sumatran orangutans in the wild, ...
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]
There are three types of orangutans left in the world. The Bornean, the Tapanuli and the Sumatran. It’s believed that there are only 14,000 individual Sumatran orangutans left in the wild.
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 ...
Puan, an orangutan at Perth Zoo, is believed to have been 62 years old at the time of her death, making her the oldest recorded orangutan. [21] The current oldest orangutan in the world is believed to be Bella, a female orangutan at the Hagenbeck Zoo , who is 61 years of age.
Orangutan Foundation International (OFI) has its headquarters in Los Angeles, California.Founded by Dr. Birutė Galdikas, one of three anthropologists (The Trimates) to study great apes under the guidance of Dr. Louis Leakey, OFI continues to rescue and rehabilitate orangutans, preparing them for release back into protected areas of the Indonesian rain forest.