Why do cats chatter when they see prey that is out of reach?

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When a cat spots prey that is out of reach, it may produce a staccato sound known as chattering. This behavior is generally interpreted as a sign of the cat's frustration or desire regarding the inaccessible target. In some instances, this chattering may even be soundless.1

Understanding these vocalizations is part of learning about cat behavior and how they communicate their needs and emotions to their human companions.1