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In this series, all animals share a common language. There are many different dialects within it, but they are mutually intelligible for anything not specialized to the needs of a single species or region. Indeed, Cousin beasts also can speak and understand this, though their faculties are significantly lesser.
At one point Firekeeper notes that this speech contains three parts. One part is verbal, one part is body language, and the last was something undefinable to her. It is reasonable to infer that there is a magical origin to this.