First, because Rikki is a mongoose. And mongooses fight snakes. Second, Rikki knows the snakes plan to kill the people, and Rikki likes the people.
Rikki-tikki fights 3 snakes, a Karait and two cobras Nag & Nagaina
There are two passages early in the story that establish that mongooses in general are natural enemies of snakes. The first is by Teddy's father (speaking of Rikki-Tikki) "Teddy's safer with that little beast than if he had a bloodhound to watch him. If a snake came into the nursery now --- '' and the second is from Rikki-Tikki's initial meeting with Nag "and he knew that all a grown mongoose's business in life was to fight and eat snakes"
he is a baby snakes who Rikki tikki tavi killed
Rikki-tikki-tavi, a short story written by Rudyard Kipling tells the story of the mongoose Rikki-tikki and his battles to protect his adopted family. His "great war" is fought with the two King cobras, Nag and Nagaina. It ends with Rikki-tikki killing both snakes and destroying their clutch of eggs.
Snakes , Fruit ,etc..
By encouraging Rikki, distracting the snakes, and obeying his orders.
Yes!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Snakes fight ! snake fight for lady snake or they fight for there area
The denouement begins when Rikki-tikki gives Nagaina a "Hobson's choice" to choose either to satisfy her revenge or to save her last egg. She chooses to try and escape with the egg. Rikki-tikki pursues her into her underground lair & in the ensuing battle her kills her & destroys the last egg.
big snakeslittle mongoosebig fightdead snakes
His courage and stubbornness.
Rikki-tikki doesn't look on himself as brave he is only doing what he sees as natural. As Kipling states "he (Rikki) knew that all a grown mongoose's business in life was to fight and eat snakes"
Rikki-Tikki is an enemy of Nag and Nagaina because they are dangerous cobras who pose a threat to the safety of the garden and its inhabitants, including the human family Rikki-Tikki lives with. Rikki-Tikki sees it as his duty to protect his new home from these deadly enemies.