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

Question

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Songbirds have complex vocalizations that involve syntax, grammar, and the ability to create new phrases. This suggests a level of communication that is much closer to human language than that of other animals. Domesticated dogs and cats also show some level of communication with humans, but it is not as complex as that of songbirds. Mice do not demonstrate a language at all.

Which Animal Demonstrates a "Language" That May Be Closest to That