Tiny, nocturnal, and expert at remaining hidden, the Bangka slow loris ( Nycticebus bancanus ) has spent nearly a century evading wildlife biologists around its native habitats on the Indonesian islands of Bangka, Sumatra, and Borneo. Before it vanished in 1937, this big-eyed creature was a member of the world’s only known group of venomous primates—via a bizarre toxin activated when the loris licks a gland on the inside of its upper arm, making its bite more dangerous or its fur poisonous via a little bit of defensive grooming.

But conservationists have finally tracked down the Bangka slow loris, a case of “ lost ” taxon presumed extinct, thanks to a series of wildlife rescues performed by Indonesia’s Alobi Wildlife Rescue Center between 2015 and 2025.…