Mountain Beidawu has well-preserved primeval forests, which provide an ideal habitat for many wildlife species.

• Mammals
  scientists have recorded 27 species, including Formosan serow,Formosan sambar, Formosan yellow-throated Marten,Formosan barking deer, Formosa macaque,and Formosan wild boar.
• Birds
  scientists have recorded 135 species, among which birds of families Timaliidae and Paridae are most common, such as White-backed woodpecker, Taiwan whistling thrush, Plumbeous water redstart and Mountain scops owl. Endangered wild birds include Swinhoe"s pheasant, Mikado pheasant and Hodgson"s hawk eagle.
• Insects
  Butterflies and insects of orders Coleoptera, Homoptera and Diptera are most active.Signature insects include Euploea sylvestor, Formosan long-armed scarab, Rainbow sheath click beetle and Stag beetle.
• Amphibians 
  Mostly seen in river valley, such as Moltreche"s green tree frog, Sauteris frog, Swinhoe"s brown frog and Taiwan common toad.