Answer:
Kiwis are a member of a group of birds with a Gondwanaland association. Other members of the group are Cassowary and Emu (Australia), Ostrich (S Africa), Moa (extinct, New Zealand), Rhea (S. America), and the Madagascar Elephant bird (extinct).

This family are known as Ratites, and all lack a keel bone in the breast to which the flight muscles would be attached. Even if they developed wings (and kiwi have rudimentary ones) they couldn't fly.

Within the Ratite group, there are several striking differences, and these may provide support for an understanding of their divergence - assuming a common ancestor.
First answer by Suma rongi. Last edit by Suma rongi. Contributor trust: 157 [recommend contributor recommended]. Question popularity: 0 [recommend question].