When the expedition finally stumbled across the serpentine amphibian, it was at the end of a road and a seven-hour hike beyond that from the nearest village. The area is known as Cleopatra's Needle.

"This is an animal that doesn't have any flashy colors or anything like that, but it's one of those last, iconic species that we couldn't find," says Brown.

Remarkably, the expedition also found the Palawan toadlet (Pelophryne albotaeniata), which had been missing for the last 40 years.