During the mating season early in the year , the males exhibit blue colouring on their backs ; their flanks are stippled black and white , and on the belly are marked with a blue stripe .

During that time , the males have a blue color on their backs . Their belly has a blue stripe . During the mating season early in the year , the males exhibit blue colouring on their backs ; their flanks are stippled black and white , and on the belly are marked with a blue stripe .
