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Chimpanzees might have the ability to express themselves with sign language at some point, much the same as we do, humans do grammatically. But as it is right now, there's no evidence. Chimpanzees, when they're using sign language and even cocoa, are using it in the same way that we do abstractions, critical thinking, things like that, other than mimicking those gestures, the sign language, in order to get things they can, I think, to some of the chimps could memorize up to 350 or more defined and express them to give what they want, but there's no evidence that suggests that they're actually using them in the way we do and for language, for abstractions. And the same thing, I would think, would apply to prairie dogs, although they're able to express themselves and express themselves within their environment. I don't think there's any evidence. I'll have to study it a little bit more on myself, but I don't think there's any evidence suggesting that they're able to communicate the same way we do with abstractions and critical thinking,