It belongs to the Anatidae family of Anseriformes order, with the scientific name of Mergus squamatus (Latin), or Chinese Merganser (English).     

It's about 58 to 63 centimeters in full length. It is metalescent sap green from head to upper neck, making the aigret distinct. Its scruff and back are jasper with white sides. The lower foreneck and the part below chest are white. The sides of upper body have gray scale-like lines. The female is chestnut brown from head to neck, with aigret. It has gray back, white belly and wings.

The bird inhabits in forest rivulets and morass, feeding on fishes and insects. It is endemic to China and has a very small number, mainly distributed in Inner Mongolia, Heilongjiang and Jilin provinces. It hibernates south to the Yangtze River.