Releasing rescued orangutans into the wild doesn’t boost populations

https://www.newscientist.com/article/2230529-releasing-rescued-orangutans-into-the-wild-doesnt-boost-populations/

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Orangutans in the wild in Kalimantan, the Indonesia part of the island of Borneo

Marc Ancrenaz

The number of Bornean orangutans is dwindling, and there is little evidence that efforts to relocate them from risky areas or rehabilitate those once held captive actually works to bolster their population.

Between 2007 and 2017, about 1200 Bornean orangutans (Pongo pygmaeus) were released into natural forests in Kalimantan, the Indonesian part of the island of Borneo. Nearly 500 of those were formerly captive individuals nursed back to health before being released into the wild. But how many of these animals are still …