Researchers teamed up with Tambrauw and Maybrat clan elders to track these elusive animals through dense forests.
Two preserved specimens were later found in a university teaching collection; a separate specimen collected earlier had also been misidentified.
Fossils from cave digs also helped connect the dots.

Both species are considered Lazarus taxa (animals thought extinct but found alive) and face threats like logging and wildlife trafficking.
Scientists are keeping their exact locations secret as they learn more about their numbers and how to protect them.