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Why humans can't use natural language processing to speak with the animals
(www.engadget.com)
Technology for a Solar-Punk future.
Airships and hydroponic farms...
Dolphins, whales, apes, bats, elephants and prairie dogs would be good candidates. For most species however, since their repertoire of communication is quite limited, attempting communication wouldn't be likely to succeed.
https://en.wikipedia.org/wiki/Animal_language
Prairie dogs, being a species well accessible by humans (they live in fixed underground "settlements", don't swim or fly where people cannot record them, and aren't dangerous to approach) have been studied to an extent, and their language does have semantics:
I imagine that prairie dogs are already capable of coming up with statements like "big cat coming slowly from north", so maybe some of their colonies, in the right conditions, develop more complex language. Since they don't travel much, each of their colonies might have a different language, however.
Perhaps the most interesting language would be that of squids: