animal
barisan
biodiversity
cercopithecidae
coastal ecosystems
ecoregions
energy
equator
flexible
force
fur
greater sunda islands
high humidity
humanoid
indonesia
indonesian archipelago
indonesian tourism
jungle
malay archipelago
mammal
medan
monkey
movement
muzzle
natural ecosystem
natural heritage
north sumatra
oceania
presbytis thomasi
primate
rainforest
republik indonesia
sinabung
southeast asia
strength
strong
sumatra
thomass langur
thomass leaf monkey
trees
tropical climate