Cúc Phương National Park
The primate center has langurs, loris, and gibbon species, include the Delacour's langur, golden-headed langur, and black crested gibbon.  These three species are critically endangered. The  Frankfurt Zoological Society helped make the center in 1993.  It has 180 animals in 50 cages, 4 houses, and two semi-wild places surrounded by fences.