In the story below, why do the Mice want to bell the Cat?

The Mice once called a meeting to decide on a plan to free themselves of their enemy, the Cat. At least they wished to find some way of knowing when she was coming, so they might have time to run away. Indeed, something had to be done, for they lived in such constant fear of her claws that they hardly dared stir from their dens by night or day.
Many plans were discussed, but none of them was thought good enough. At last a very young Mouse got up and said:
"I have a plan that seems very simple, but I know it will be successful. All we have to do is to hang a bell about the Cat's neck. When we hear the bell ringing we will know immediately that our enemy is coming."
All the Mice were much surprised that they had not thought of such a plan before. But in the midst of the rejoicing over their good fortune, an old Mouse arose and said:
"I will say that the plan of the young Mouse is very good. But let me ask one question: Who will bell the Cat?"
system
neeche di gai kahani main, chuuhe billi ko kyon rokna chaahate hai?

chuhon ne ek baar apane dushman, billi se khud ko mukt karne kii yojana kaa faisla karne ke liye ek baithak ko bulaayaa.kam se kam ve yah jaanane ke kisi na kisi tarah se khojna chaahate the ki vah kab aa rahi thi, isliye unke paas bhaagane kaa samay ho saktaa he.vastav main, kuch kiya janaa tha, kyonki ve uske panje ke aise lagaataar dar main rahete the ki ve shaayad hi raat yaa din tak apane dence se halchal karte the.
kai yojanaon par charchaa kii gai thi, lekin unamem se kisi ko bhi acha nahin mana gaya.ant main ek bahut yuva mouse uthakar kaha:
"mere paas ek yojana he jo bahut saral lagati he, lekin mujhe pataa he ki yah safal hoga. hamen bas itnaa karnaa he ki billi kii gardan ke bare main ek ghanti lataka di jaae. jab ham ghanti bajaate hue sunate hai to hamen turant pataa chal jayega ki hamaara dushman aa rahaa he."
sabhi chuhon ko bahut aashcharya hua ki unhone pehle is tarah kii yojana ke bare main nahin sochaa tha.lekin apane saubhaahgya par anand ke bich main, ek purana mouse uthta he or kaha:
"main kahuunga ki yuva mouse kii yojana bahut acchhee he. lekin mujhe ek sawaal poochne den: billi ko koun legaa?"
user
chuuhe billi ko ghanti bananaa chaahate hai taaki ve use aane main sakasham hon or bhaagane kaa samay ho jaae.
assistant
<|system|>
</s>
<|user|>
neeche di gai kahani main, chuuhe billi ko kyon rokna chaahate hai?

chuhon ne ek baar apane dushman, billi se khud ko mukt karne kii yojana kaa faisla karne ke liye ek baithak ko bulaayaa.kam se kam ve yah jaanane ke kisi na kisi tarah se khojna chaahate the ki vah kab aa rahi thi, isliye unke paas bhaagane kaa samay ho saktaa he.vastav main, kuch kiya janaa tha, kyonki ve uske panje ke aise lagaataar dar main rahete the ki ve shaayad hi raat yaa din tak apane dence se halchal karte the.
kai yojanaon par charchaa kii gai thi, lekin unamem se kisi ko bhi acha nahin mana gaya.ant main ek bahut yuva mouse uthakar kaha:
"mere paas ek yojana he jo bahut saral lagati he, lekin mujhe pataa he ki yah safal hoga. hamen bas itnaa karnaa he ki billi kii gardan ke bare main ek ghanti lataka di jaae. jab ham ghanti bajaate hue sunate hai to hamen turant pataa chal jayega ki hamaara dushman aa rahaa he."
sabhi chuhon ko bahut aashcharya hua ki unhone pehle is tarah kii yojana ke bare main nahin sochaa tha.lekin apane saubhaahgya par anand ke bich main, ek purana mouse uthta he or kaha:
"main kahuunga ki yuva mouse kii yojana bahut acchhee he. lekin mujhe ek sawaal poochne den: billi ko koun legaa?"</s>
<|assistant|>
chuuhe billi ko ghanti bananaa chaahate hai taaki ve use aane main sakasham hon or bhaagane kaa samay ho jaae.</s>
