Rare frog thought to be extinct rediscovered in Mindanao Published March 12, 2021 11:18am A pair of Filipino biologists has rediscovered in Mindanao a rare frog species that was thought to be extinct decades ago. Guttman's stream frog ( Pulchrana guttmani), first seen in 1993, was rediscovered by Kier Mitchel Pitogo and Aljohn Jay Saavedra in the forests of Mount Busa, according to the United States Agency for International Development (USAID). The Guttman's stream frog is "an amphibian so rare, it was thought to be extinct for decades since it was first recorded," USAID said in a Facebook post. In a paper published in Herpetological Notes, Pitogo and Saavedra said the Guttman's stream frog is possibly the rarest amphibian in the Philippines.