The proposed Arboretum plays a significant role as a green corridor habitat for birds in providing food and shelter by the displayed high biodiversity of birds. Nocturnal birds documented were the Reddish Scoop Owl (Otus rufescens) and Savannah nightjar (Caprimulgus affinis) Studies of birds diversity in naturally regenerated acacia forest in Sabah is still lacking. There were 10 species of birds recorded and 28 individuals were captured. The family Alcedinidae was the most abundance (48%), was followed by Rhipiduridae (16%), Pycnonotiidae (12%) and Timaliidae (12%). The results of the study shows nine families of birds occurring in the arboretum, of which seven families were diurnal birds and two families were nocturnal birds. The results of this study show that the vegetation at the proposed arboretum is naturally regenerated acacia forest. Captured birds were identified, measured according to standard methods and ring banded. Mist netting was employed the bird survey to capture diurnal and nocturnal birds. Trees were identified up to species level. The vegetation survey was conducted using sampling plot that enumerates trees with DHB 10cm and above. Vegetation survey and bird surveys were conducted during this study. It elapsed from the 19 February to 14 March 2014 for the period of 24 days of survey. This study focuses to document the diversity of understory birds at the proposed arboretum (about 3.1 hectare) of UMS Campus. They are known to be a potential bioindicator of forest ecosystem health. Birds are amongst the important agent of maintaining the forest ecological balance.
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