Forest rangers in the central city of Da Nang released an endangered douc langur to a nature reserve on Thursday.
The douc was previously discovered by Phan Van Quy, a local farmer, in a forest in Hoa Vang District.
Quy said the six-kilogram ape looked frightened as if it had been strayed from its troop.
He then handed over the douc to the Hoa Vang District Forest Protection Division, which in turn took care of the animal and released it to the Son Tra Peninsula Nature Reserve.
In June, a grey-shanked douc that went astray into Bai But Tourism Area was also handed over to the municipal Forest Protection Department.
After several days of treatment, the department released the douc to the Son Tra Peninsula Nature Reserve.
Since 2005, the department has rescued and released nine douc langurs to the wild.
The douc langurs are among the most beautiful primates in the world. All three species are endemic to Indochina.
The three species are the red-shanked douc langur (Pygathrix nemaeus), black-shanked douc langur (Pygathix nigripes) and gray-shanked douc langur (Pygathix cinereus).