A tree top hut is one built on branches of trees using logs, bamboo, thatch and similar materials. Such huts are made in jungle areas to protect residents from wild animals, especially during night.

The huts at the deer park are replicas of the real tree top huts. You have to climb up to the tree top house through a wooden staircase.
Thenmala Ecotourism also maintains a tree a top hut with facilitites for overnight  stay in the Shenthuruney forests..
Tree top hut

One of the tree top huts in the deer park at Thenmala, Kerala, India