Golden Frog (Bufo periglenes). Field Museum of Natural History, Chicago. FMNH nos. 167967-69. Conservation status: extinct. This species was known only from the Reserva Biologica Monteverde, Costa Rica, a pristine reserve at 1500-1600m elevation that is far from human contact. A common and well-known species until 1987, the population crashed in 1988. That year only eight males and two females were located. A significant number of frog and toad species disappeared at the same time. Chytridiomycosis (a fungal disease) and climate change are believed to be the causes of decline. A single Golden Frog male was found in 1989 and he was the last record of the species.