The populations in different geographic regions of Taiwan show a different composition of ventral colouration : the eastern population is all blackish ( 100 % ) , the central and southern populations are mostly white to gray ( both 80 % ) , and the proportions of blackish and white-gray phases in the northern population are 60 % and 30 % , respectively .
The populations in different geographic regions of Taiwan reveal a unique composition of ventral colouration : the eastern population is exclusively blackish ( 100 % ) , the central and southern populations are mainly white to gray ( both 80 % ) , and the proportions of blackish and white-gray morphs in the northern population are 60 % and 30 % , respectively .