Roland Seitre / Hatinh langur (Trachypithecus hatinhensis / Trachypithecus laotum hatinhesis) infant. Captive, occurs in Lao People's Democratic Republic and Vietnam. Endangered species.

Chien Lee / Hatinh Langur (Trachypithecus hatinhensis) female and young, Cuc Phuong National Park, Ninh Binh, Vietnam

Chien Lee / Hatinh Langur (Trachypithecus hatinhensis), Cuc Phuong National Park, Ninh Binh, Vietnam

Roland Seitre / Hatinh langur (Trachypithecus hatinhensis / Trachypithecus laotum hatinhesis) portrait. Captive, occurs in Lao People's Democratic Republic and Vietnam. Endangered species.

Joel Sartore / Photo Ark / Hatinh langur (Trachypithecus hatinhensis) head portrait, Endangered Primate Rescue Center, Cuc Phuong National Park, Vietnam. Captive. Endangered.

Roland Seitre / Indochinese black langur (Trachypithecus ebenus) feeding, captive. Occurs in Laos and Vietnam