One thing which puzzles me is what is the explanation for kiwi bird's wings - they are so tiny and do not seem to have any use, or that could use it in future.
You're looking at it the wrong way round. The kiwi's wings are not used for flight because they evolved in a niche where flight was not required. Instead they grew large and heavy.
There are two views, one is that the birds never had flight and the more modern one based on DNA evidence that they lost it after migrating to countries where flight was unnecessary about 60 million years ago.
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