The Indian monkey is black, but very clever, and its lifestyle

Indian monkey body has yellow color and their mouth is black. Indian monkey also known as gray langur .

    

Gray langur (Semnopithecus), also called Hanuman langur .

Ramayan 

The monkey (vanara) helped Rama to make war with Ravana.When Ravana carried Sita first on his shoulders and then in the chariot, she threw some of her jewels towards the monkeys .

The meaning of vanara

vana-forest

 nara-man

 thus meaning "forest man".

In the battle of Rama and Ravana, a bridge was built to kill Ravana and save Sita Devi.