On the 20th anniversary of the saola's discovery, conservationists say the population of the reclusive species has dropped dramatically
Wild saola caught on a camera-trapped in Bolikhamxay Province, central Laos
An 'Asian unicorn' or saola caught on a camera-trapped in Bolikhamxay Province, central Laos in 1999. Photograph: William Robichaud/WWF International
Poaching in Vietnam and Laos may be driving the "Asian unicorn" to extinction, warns the WWF on the twentieth anniversary of its discovery.