It is suitable for butterflies at the habitats with plenty of sunlight, clean water, and nectar plants. Moist and warm climate and highly diverse vegetation in Taiwan, where provide a very favorable environment for butterflies. There are 407 recorded butterfly species in Taiwan, and it can be found 167 species (41%) in the Yang Ming Shan National Park, especially in the Damn Mountain area. This research investigated butterfly occurred at the Erzihping Trail for six months period (from Aug. 2008 to Jan. 2009). The species, biology of butterflies, and the vegetation of nectar plants and weather with butterflies were recorded by transect count method. During the 6 months, 78 butterflies that are 23 species in 4 families were recorded, 53 one (67.9%) of them were Nymphalidae family. The peak butterfly for 61 butterflies was occurred on August 2008, checking in the quantity of butterflies with monthly mean temperature, it was shown that butterflies did more active above 20℃. There were the same 10 species on this research about 23 species and previous reference about 20 species, but it was recorded more 13 species at this area by the research, So it will be 33 species of butterflies at the Erzihping Trail on Damn Mountain in Yang Ming Shan National Park.
