(Incilius cristatus), a critically endangered species of true toad in the family Bufonidae. Majorcan midwife toad (Alytes muletensis) Taudactylus rheophilus (northern tinker frog, tinkling frog), a species of frog in the family Myobatrachidae. Philautus chalazodes (chalazodes bubble-nest frog, white-spotted bush frog or Günther's bush frog), a species of frog in the family Rhacophoridae; no verifiable reports of this species, until its rediscovery in 2011. Guttman's Stream frog (Pulchrana guttmani) Sumatra toad (Bufo sumatranus), a species of toad in the family Bufonidae. Telmatobufo venustus, a species of frog in the family Calyptocephalellidae, not seen from 1899 until 1999. Thorius minutissimus, a species of salamander in the family Plethodontidae. Mammals Bavarian pine vole (Microtus bavaricus), is a vole in the family Cricetidae; believed extinct in the 1960s, until it was rediscovered in 2000. Black-footed ferret (Mustela nigripes), a North American species presumed extinct in 1979 until it was rediscovered in 1981. A captive breeding program of the discovered ferrets successfully reintroduced the species into the wild. Brazilian arboreal mouse (Rhagomys rufescens), a South American rodent species of the family Cricetidae; first described in 1886, was believed to be extinct for over one hundred years. Bouvier's red colobus (Piliocolobus bouvieri), a species of colobus monkey rediscovered in 2015. Onychogalea fraenata (Bridled nail-tail wallaby, bridled nail-tailed wallaby, bridled nailtail wallaby, bridled wallaby, merrin or flashjack), a vulnerable species of macropod; thought to be extinct since the last confirmed sighting in 1937, but rediscovered in 1973. Caspian horse (Khazar horse), thought to be descended from Mesopotamian horses; remains dating back to 3400 B.C.E, but it was rediscovered in the 1960s. Zyzomys pedunculatus (central rock rat, central thick-tailed rock-rat, Macdonnell Range rock-rat, Australian native mouse, rat à grosse queue or rata coligorda), a species of rodent in the family Muridae; thought to be extinct in 1990 and 1994, until a reappearance in 2001 and in 2002, then the species went unrecorded until 2013. Cuban solenodon (Atopogale cubana), thought to have been extinct until a live specimen was found in 2003. Dinagat bushy-tailed cloud rat, assumed extinct after discovery in 1974, but rediscovered in 2012. Eastern black crested gibbon Fernandina rice rat (Nesoryzomys fernandinae), thought extinct in 1996 (last seen 1980) but found again in the late 1990s. Gilbert's potoroo (Potorous gilbertii), extremely rare Australian mammal presumed extinct from the 19th century until 1994. Gould's mouse (Pseudomys gouldii) Humboldt marten (Martes caurina humboldtensis), subspecies of the Pacific