Commonality of Worldwide Myths

The basic idea is crankish to say the least. Even if some myths "coded" the Precession of the equinoxes (an idea that is at least superficially plausible as a possiblity) to take that further and claim that all myths are based on Precession or even that all cultures have a Precession myth is something that would require a lot of evidence.See this page for some critical views.
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Animals don't have language in the full sense that we do. So any comparison on that ground would be highly questionable.However I have read that songbirds DO have different "dialects" - i.e. there are regional variations in song within a species.

Animals can certainly communicate. But none come close to a full human language. With training a chimpanzee can manage a level equivalent to a young child (a 5 year old IIRC).But it also must be remembered that the comparison offered is not even rudimentary language, but simple basic sounds. At that level there is much more commonality between humans - and even then I seem to recall that most animals are - relative to humans - quite limited in the range of sounds they can make.

The evidence is that chinpanzees ack the capability to handle language - any language - at anything near the level of a human adult. Doubtless, extinct hominid species could do better - but it is rather hard to test the language capabilities of an extinct species.c

The "Tower of Babel" story as it stands is a myth.Moreover, the tendency for languages to diverge is a fact (or to be more accurate was a fact before the advent of modern communications) and thus there is no reason to propose a single event causing languages to miraculously diverge.

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After all isn’t our word ”dragon’ derived from the Chinese/Japanese word? Isn’t the more traditional European word ”Wyrm’?

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I don't think so. I'm pretty sure that "dragon" is from Latin, "wyrm" (or "worm") is Germanic and the Chinese word is "Lung".

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On that note don’t Chinese/Japanese Dragons tend to be more celestial creatures rather than the Flesh, bone and Winged monstrosities of European folk tales?

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That, OTOH, is true.

There is certainly some reason why the Babel myth arose. But it might be no more than curiosity and the story-telling impulse. Why are therediffernet peoples with different languages ? what were those large, ancient ruins ? how do we fit those into our world-view ? Here's a story...I suppose it is possible that the Babel story - like the Flood story - is derived from more ancient tales. But if there is an underlying factual basis for the story it lies well beyond those older stories and can't be reliably discerned from the Bible.E

I don't think that language drift is a survival mechanism in itself. Short-term drift may be partly due to group-bonding (members of a group - or wannabe members - pick up and use terms coined within the group). Longer term divergence simply follows because new terms are invented and spread locally and because pronunciation tends to vary.On worldviews I think you need to consider that the originators of the myth had a very different worldview form yours - and probably a quite different view of God.