What you read in Zoology is mostly written by European/US scientists. There are plenty of Flora & Fauna that has not been catloged in India, Nepal, and the vicinity (I am sure, same is true in Africa).
When I was growing up, my Dad was helping the Indo-British groups to catlog species in the dense forests of mid-east India. My understanding is that some of the areas are so difficult to get at that no civilized human has ever set foot for hundreds of years. Which means, there may be stuff that is unknown to us.