How does the geographic distribution of large flightless birds support Darwin's theory of evolution?

The geographic distribution of large Flightless Birds, such as ostriches, emus, and kiwis, supports Darwin's theory of evolution by illustrating how species adapt to their environments through natural selection. These birds evolved independently on different continents, reflecting the influence of isolation and varying ecological niches. Their similarities in size and flightlessness suggest a common ancestor, while their distinct adaptations highlight how species evolve in response to local conditions. This pattern of divergent evolution aligns with Darwin's ideas about adaptation and speciation.