The descriptions of Nag and the dialogue in paragraphs 23-24 imply that Nag is a serpent to be dreaded.
Nag makes his initial appearance as Rikki-tikki is speaking with Darzee, the tailorbird, in the bungalow's garden.
When Darzee is telling her about how Nag ate one of her eggs that fell out of her nest the day before, Nag sneaks up behind Rikki-tikki, but Rikki-tikki notices Nag.
Nag's head went through the sluice, followed by his five feet of frigid body, and Rikki-tikki tingled with rage and disgust. Rikki-tikki, no matter how angry he was, was afraid when he saw the size of the enormous cobra.
The basic theme of the narrative, "Rikki-Tikki-Tavi,' is that good may triumph over evil if one meets one's anxieties with bravery.
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