Cat Ba’s beautiful national park is home to 32 types of mammal, including most of the world’s 65 remaining golden-headed langue; the world’s most endangered primate. There are some good hiking trails here, including a hardcore 18 km route up to a mountain summit. Of the mammals present in the park, the more commonly seen include macaque, deer, civets and several species of squirrel, including the giant black squirrel. Seventy bird species have been spotted here, including hawks, hornbills and cuckoos. Cat Ba also lies on a major migration route for waterfowl that feed and roost on the beaches in the mangrove forests. Over a thousand species of plants have been recorded in the park, including 118 trees and 160 plants with medicinal value.