I’ve heard many sounds from many animals that did not have anything to do with danger, not to say that I understood what was being said. Turkeys make a variety of sounds while looking for insects through the woods and field. Does “talking” to each other on the way to browse . Blue Jays can make nice sounds to the nestlings. And then there’s whatever the cats purr expresses. I’ve seen video footage of many animals expressing care for another.
I’m sure they all express many things, as do humans.
It’s debatable whether it fully counts as language, but there are definitely birds that have some of the characteristics of language. For example, songbirds have vocal learning, which is pretty advanced, and if you listen to some young birds practicing their songs, it sounds remarkably similar to the babbling of a human baby. Some species may show something like grammar or syntax in how they use the sounds they make.
In general, what is now being learned about birds is that we were mistaken when we assumed they could not be intelligent because their brains are smaller and not structured like ours. A tiny chickadee can remember hundreds of places where it has stored food, and I can’t remember where I put my phone five minutes ago. 
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XD i do the same thing, perhaps the birds are smarter than i am!
i like to imagine that the animals’ noises are a language, even if they might not truly count as one- especially the dolphins, i would love to learn their language.
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https://theconversation.com/are-we-really-about-to-talk-to-whales-229778
Since ‘we’ focus on large and charismatic animals.
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I believe we are on the cusp of breaking into the world of nonhhuman species communication. The AI advances will push us there. And not just animals. What about plants, fungi, micro organisms? Collective networks (eg. forests)?
Life is the result of information interaction from the molecular level up. Considering our species incredible degree of isolated disconnection and self-absorption, do you think we’ll be able to collectively handle what other lifeforms may have to say about us when we open up those channels? Hmm.
My favourite inter-species interaction has got be observing jumping spiders. You can’t help but be impressed by their stares and curiosity.
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That would certainly be a use of AI I’d approve of. And I do believe you may be right. Pattern recognition (which any language (we know) ultimately boils down to) is the core strength of the current AI models.
I think a limiting factor to consider, though, would be our language. Human languages are a reflection of the human experience. Which may not be shared by other species, especially those inhabiting very different ecological niches and only distantly related to us. Even if AI were to be able to decode the signals between trees and fungi in forests, I doubt that they would be in any way comprehensible to us. It’s like imagining a colour that we have never seen.
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I would agree that human language has tons of biased baggage, and it has interfered with our grasp and study of reality since it’s inception. Science (and art, and politics) struggles to this day to avoid linguistic biases.
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It’s always funny when Science is “on the cusp of Discovering” something that ordinary people have known and have been doing for centuries …
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Most birds in our area are extremely easy to scare so they must be domething like ‘oh no! The humans again. Geez, they’re so many… I’m out of here guys’ 
that means less good pics with birds in Argeş… same with the mammals… insects are okay with humans’ presence so far here…
I don’t know I think insects know more than we will ever know.
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