This is a reflex and it is used when cats cannot reach their prey. The movements of the jaw cause the teeth and lips to smack making small noises. That would explain the chattering.
Chattering is primitive, instinctive behaviour. It is used to summon other cats, which is paradoxical because the modern cat doesn't hunt in packs. To better understand this behaviour, it is best to look to viverrids (mongoose, civet, genet) which predate cats on the evolutionary ladder.
Because the cat would be in hunting mode. Chattering of the teeth or making certain sounds means that they are hunting something or want to hunt something.
When you are cold, your muscles contract (become tighter) quickly to warm you up. This is called shivering. Your teeth chatter as your muscles in your jaw move. [Just to clarify: MY teeth do not chatter when YOU are cold]
A dogs teeth may chatter and they may drool if they are nervous. This can also happen if they have a dental disease.
Because they desperately want to be stalking and killing said birds, most likely. Cats are born hunters, and will often kill just for the fun of it. Basically, that quivering chirping is an expression of combined excitement and desire.
Loud chatter can be an attention-getter, reminding you that she is there. In the wild, birds often chatter in the evening before going to sleep to connect with other flock members.
Cats. Every bad thing in life can be blamed on cats!
Chatter
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PARROT
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Chatter can be a noun or a verb. Examples:Noun: There is a lot of chatter but no real information on the subject.Verb: We had a good time; all we did was chatter about old times.
Project CHATTER ended in 1953.
Project CHATTER was created in 1947.
The chatter of the hamster gave no peace and I persisted through the night without any sleep.
The collective noun is a chatter of budgies.
Gee, she's a real chatter box. When the squirrel saw a nut he began to chatter. They went on and on chattering about their dead plants. Chatter= to talk rapidly or incessantly on trivial matters