In conjunction with the issue WWF stamp series, Sao La, Vietnam Post issued the official first day cover which have a specific post marked. This local WWF cover has sealed with 4 postage WWF stamp, depicted Sao La.
The Saola (Pseudoryx nghetinhensis), Vu Quang ox inhabits the Annamite Range's moist forests of Vietnam and the Eastern Indochina dry and monsoon forests. They have been spotted in steep river valleys at about 300 to 1800 m above sea level. These regions are distant from human settlements, covered primarily in evergreen or mixed evergreen and deciduous woodlands. The species seems to prefer edge zones of the forests.
The Saola (Pseudoryx nghetinhensis), one of the world's rarest mammals. The species was "discovered" by science in 1992 in Vu Quang Nature Reserve by a joint survey of the Ministry of Forestry and the World Wide Fund for Nature
The Saola stands about 85 cm at the shoulder and weighs approximately 90 kg. The coat is a dark brown with a black stripe along the back. Its legs are darkish and there are white patches on the feet, and white stripes vertically across the cheeks, on the eyebrows and splotches on the nose and chin. All Saolas have slightly backward-curved horns, which grow to half a meter in length.
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