Crows can remember a human face for 17 years, and pass this knowledge through their murder (group).
We know animals communicate with each other, and the trend is we generally discover more and have underestimated what many animal species practice and can do.
Everyone agrees that homo sapiens and homo neanderthalensis have talked together and lived (and bred) together; what makes inter-species communication (assuming a translator or device) impossible?
No, I don’t think “universal translators” are outside the domain of science fiction; but I think us building a device that enables two-way communication between one species and us, is probably more likely than not.
[1]: https://urban.uw.edu/news/crows-hold-grudges-against-individ...
I think you are very naïve about how complicated language is. I'm not saying animals lack any intelligence whatsoever, but I don't see how remembering faces means you'll be able to talk. The crows could just have acted hostile to the masked people in front of each other. Communicating is not the same thing as language which is vastly more expressive than any non-human animal is capable of.
Not everyone agrees that Neanderthals possessed language like us either, although evidently they are much, much closer evolutionarily to us than crows or whales, and it is vastly more plausible that they talked. Having Neanderthal DNA doesn't mean that we talked with them though, it needn't have been even consensual, unfortunately.
I pissed off a crow once, not a good idea. It got its revenge and it was crazy how its murder group would destroy my property. Luckily they have moved on but I make friends with them now and understand them much better.