Ruptga
Lifer
- Aug 3, 2006
- 10,246
- 207
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So what you're asking is "why hasn't convergent evolution produced more species identical to transitional forms we see in the fossil record?"
In most cases in the short term, another, different species is successful enough at exploiting an environment that it takes over that niche from any other species that could survive there. In the longer term, the whole ecosystem may change so much that there is no longer a niche to fill.
To your specific niches mentioned, humans are so successful that we have taken over any niches neanderthals may have filled; and we've changed ecosystems so much that those niches probably don't exist anymore.
But if you're looking for modern-day whale-cows, here you go:
Notice how they're even called a "pod", like whales?![]()
Now that was the /thread. For a succinct answer that's as good as you're going to get.
