Which animal shows the most courage in helping Rikki Tikki?

In "Rikki-Tikki-Tavi" by Rudyard Kipling, it is Darzee, the tailorbird, who shows great courage in helping Rikki-Tikki. Despite his initial fear of the cobras Nag and Nagaina, Darzee bravely provides information about their plans and even distracts Nagaina during the climactic battle. His willingness to assist Rikki-Tikki, despite the danger, exemplifies his courageous spirit and loyalty to his friend.