What specific physical characteristics define the kiwi's terrestrial adaptation in New Zealand?
Answer
Disproportionately large, muscular legs and hair-like feathers
The physical hallmarks of the kiwi are direct results of millions of years evolving without the need for aerial evasion. Their legs are disproportionately large and muscular, built for powerful terrestrial movement across the forest floor. Furthermore, their feathers have evolved to be more hair-like, lacking the interlocking barbules necessary to create the smooth surface required for flight. These adaptations supported their nocturnal, ground-dwelling lifestyle centered around probing the soil for food, rather than evasion via flight.
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