when Rikki-Tikki Tavi was exploring the garden his new caretakers own he was a bird who looked troubled.
One of our babies fell out of the nest and Nag ate him!
After Rikki heard and saw the cobras Nag and his wife Nagiana who ate the bird Darzees's chicks he knew these cobras were afraid of him and were plotting to kill his new family, and a mongooses job is too kill cobras so Rikki may have to face his fears and kill the cobras in order to save his family and the other animals of the garden
“he will have to go away, and then the garden will be our own again. Go in quietly, and remember that the big man who killed Karaitis the first one to bite. Then come out and tell me, and we will hunt for Rikki-tikki together.” “But are you sure that there is anything to be gained by killing the people?” said Nag.“Everything. When there were no people in the bungalow, did we have any mongoose in the garden?So long as the bungalow is empty, we are king and queen of the garden; and remember that as soon as our eggs in the melon-bed hatch (as they may tomorrow), our children will need room and quiet.”“I had not thought of that,” said Nag. “I will go, but there is no need that we should hunt for Rikki-tikki afterward. I will kill the big man and his wife, and the child if I can, and come away quietly. The bungalow will be empty, and Rikki-tikki will go.”
Rikki and Nag meet up in the bathroom and fight, Rikki kills Nag by beating him against the wall