Large flightless birds of the southern continents — African ostriches, Australian emus and cassowaries, South American rheas and the New Zealand kiwi — do not share a common flightless ancestor as once believed.
Large flightless birds of the southern continents — African ostriches, Australian emus and cassowaries, South American rheas and the New Zealand kiwi — do not share a common flightless ancestor as once believed.