This article first appeared on iCatCare here.
Teeth-chattering is usually heard when there’s a bird outside the window which a cat is watching but can’t get to. It may then run up to the window or sit and make this strange tooth-chattering noise, which may be frustration or excitement or both.
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I’ve been wondering about that ever since I saw a video where a cat was chattering at the snow. Mystery solved!
One of my cats would chatter at birds, the more chattering the bigger the bird. The other would make a sound, an “unk”:- sparrows and tits being one unk, starlings unk unk, pigeons unk unk unk, and Corvids (and foxes) unk unk unk unk!