margaret, good description of that noise your cat makes. The "trill" sounds just like the noise my Marius makes all the time. I called it a chirrup, but it sounds (pardon the pun)likes it's the same kind of noise. Weird! He makes those noises when he jumps on or off things too, and when he's greeting me, and well...most of the time, which is why I found it so odd! Bless his little heart Cats are so funny...

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"In a cat's eye, all things belong to cats." - English proverb