Which animal demonstrates a "language" closest to that of humans?

Question

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Songbirds have a complex system of communication that involves not only songs but also calls and gestures. These birds have unique songs that they learn from their parents and can change or modify throughout their lives. They also have specific calls for different situations, such as warning calls or courtship calls. The structure and complexity of their communication system have been compared to human language in some studies.

Which Animal Demonstrates a "Language" Closest to That of Humans