In general the fauna of the montane forest is rather poor and even though observation of animals is very difficult because of the dense forest, on a bright morning it seems the forest becomes alive. We can hear everywhere birds singing and see them flying. There are about 200 species of bird in the area, including the pygmy tit (Psaltris exilis) which is only know from west Java's mountains and the sole representative of an endemic genus. Primate species which occur in the park include the Javan gibbon (Hylobates moloch), Javan leaf monkey (Presbytis aygula), silvered leaf monkey (Presbytis cristata), and the long-tailed macaque (Macaca fascicularis). Leopard (Panthera pardus) is still the only large predator of West Java, besides the extremely rare wild dog (Cuon alpinus) which also exists in this park.
Other species of mammals are the wild pigs (Sus scrofa), the Javanese/stink badger (Mydaus javanensis), the leopard cat (Felis bengalensis) and the yellow-throated martin (Mustela flavigula).

The park is home to manyspecies of mammal. These include the stink badger (Mydaus javanensis), flying lemur (Galeopterus variegatus), barking deer (Muntiacus muntjak), lesser mousr-deer (Tragulus javanicus) and two species of wild pig (Sus scrofa and S.verrucosus).

Four species of primate live here and are all frequently seen : Javan gibbon (Hylobates moloch). Javan leaf monkey (Presbytis comata), ebony leaf monkey (trachythecus auratus), and long-tailed macaque (Macaca fascicularis). The two Javanese endemics are currently listed as endangered.

Other rare mammals include leopard (panthera pardus), leopard cat (Felis bengalensis) and wild dog (Cuon alpinus javanicus). Junghuhn's observations of 1839 tell us that Javan rhino (Rhinoceros sondaicus) once roamed the erea; regrettably no recent records exist.

Many different kinds of bird inhabit the park; more than 251 species from the Javan list of 450 have been recorded. Scaece or beautiful birds, such as the Javan hawk-eagle (Spizaetus bartelsi), the blue-tailed trogon (Harpactes reinwardteii)(Otus angelinae) attract bird-watchers from all over the wold.