The conclusion implied by the title seems self evident for anyone who has seen any (at least) nonhuman mammalian predator.
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Then comes the need to transmit/transfer understanding.
From the fine article:
> various properties that human languages have—there are about 7,000 of them spoken and signed across the world—are optimized for efficiently transmitting information, making things easy to perceive, easy to understand, easy to produce and easy to learn for kids.