Phu Quoc Natural Reserve was established in 1986 and in 2006 expanded to a total are of 37,000 ha with a new name Phu Quoc National Park. Phu Quoc National Park with diverse flora and fauna covers mainly the mountainous northern part of Phu Quoc (50% of the island). There are nearly 929 tree species of which 19 newly-found species are first recorded in Vietnam. The forest is home to many species of birds and small mammals (flying squirrels, sloth-monkeys ?) As explained by the French Larousse dictionary, the famous Phu Quoc dog is a well-tamed wild canine species which has become hunters? favorite companion. Trekking through the park should be done in the dry season only.