Conservation status

Four species are Critically Endangered (Piliocolobus ru-fomitratus, Rhinopithecus avunculus, Trachypithecus delacouri, and Trachypithecus poliocephalus), 14 are Endangered (Nasalis lar-vatus, Presbytis comata, Piliocolobus badius, Piliocolobus kirkii, Piliocolobus pennantii, Pygathrix nemaeus, Pygathrix nigripes, Rhinopithecus bieti, Rhinopithecus brelichi, Simias concolor, Trachypithecus auratus, Trachypithecus geei, Trachypithecus pileatus, and Trachypithecus vetulus), seven are Vulnerable (Colobus satanas, Colobus vellerosus, Presbytis potenziani, Piliocolobus gordonorum, Rhinopithecus roxellana, Trachypithecus francoisi, and

Trachypithecus auratus auratus, a subspecies of Javan langur (Trachypithecus auratus). (Photo by Art Wolfe, Inc./Photo Researchers, Inc. Reproduced by permission.)

1. Northern plains gray langur (Semnopithecus entellus); 2. Western red colobus (Piliocolobus badius); 3. Mantled guereza (Colobus guereza); 4. Banded leaf-monkey (Presbytis melalophos); 5. Olive colobus (Procolobus verus). (Illustration by Wendy Baker)

1. Golden snub-nosed monkey (Rhinopithecus roxellana); 2. Proboscis monkey (Nasalis larvatus); 3. Mentawai Island langur (Simias concolor); 4. Juvenile silvery leaf-monkey (Trachypithecus cristatus); 5. Adult female silvery leaf-monkey (T. cristatus); 6. Red-shanked douc langur (Pygathrix nemaeus). (Illustration by Wendy Baker)

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