Polydactylism is one of the mutant traits of the limbs in farm animals. The incidence of polydactylism in Muscovy duck (Cairina moschata) in Nigeria is reported in this study. Only one (1) female Muscovy duck was found expressing the trait out of 1020 adult males (287) and females (733) sampled in three agro-ecological zones in Nigeria. The observed (0.098%) and calculated (0.0005) gene frequencies of polydactyly were highly (P<0.001) significantly different to the expected. 1534692953.php