Im feeding birds in front of my house...and my kitten will be looking curiously with the same sound...I read it from somewhere...actually that sound resembles their rehearsal on how they are going to catch their prey...so ur cat is not the only cat that having sawan....all the cats in this world are having the same sawan....

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"In the beginning, God created man, but seeing him so feeble, He gave him the cat."
- Warren Eckstein