Quote Originally Posted by Laura's Babies
Chester was sitting at the front door this morning doing that "ack, ack, ack" thing at a bird. Just as I grabbed the camera, he stopped. His mouth works so funny when he does that.. Do they do that when they see birds?
According to the book "Catwatching" by Desmond Morris, the chatter of the cat's teeth when watching a bird, is known as 'vacuum activity'. I'll quote from the book, "The cat is performing its highly specialized killing-bite, as if it already had the unfortunate bird clamped between its jaws."

So, cats watching birds might be cute to us, but to a cat it is serious and deadly business.

Brian