Bolen and Lovely were brought from Kokrajhar in April 2018 to be part of the pilot experiment of the state’s Golden Langur Conservation Breeding Programme. The initiative had been mandated by the Central Zoo Authority, New Delhi.

The Golden Langur (Trachypithecus geei) was discovered in 1953 by naturalist E.P. Gee. These langurs are arboreal leaf-eating creatures and are only found in the forests in Assam (primarily in the areas of the Manas Biosphere Reserve) and Bhutan.

About the Golden langur

a) It is an endangered species of primate endemic to Bhutan and areas of Assam state, India immediately bordering Bhutan.

b) It is also known as the Gee Golden Langur.

c) The colour of the adult golden langur screen ranges from cream to golden. So, it is called as the Golden Langur.

d) Generally, these langurs live on the high trees where its long tail serves as a balancer.

e) IUCN status- Endangered