Rhino (1987)

Jonti, Bubul and Dhanai live near a Rhino reserve in Assam. Playing in the forest one morning they discover the carcass of a Rhino trapped in a pit with his horn cut off. The kids inform the forest ranger. Later when they overhear the conversation of a smuggler fixing a place to transfer rhino horns, the kids rush to inform the ranger only to find him away. It is now up to the brave kids to help save the forest.