Hong Kong post collaborated with WWF organization issued the stamp series of Chinese White Dolphin in 1999. The issued stamp in 4 denomination values with marked WWF logos. Another issue are maxi cards that depicted more detail of this species and local FDC.
The Chinese White Dolphin (Sousa chinensis chinensis), also called Indo-Pacific Humpback Dolphin, is a species of the Humpback dolphin and is one of eighty cetacean species.
The adult dolphin is usually white or grey in colour. They exhibit a pink-coloured skin. This colour of the skin is not a result of colour pigmentation, but is actually from blood vessels.
The adult's body length is about 200 - 350 centimetres and the infant's body length is about 1 metre. The average weight of an adult is around 150 to 230 kilograms.