"A new study by the University of Adelaide's Australian Centre for Ancient DNA (ACAD), has solved a 150-year-old evolutionary mystery about the origins of the giant flightless 'ratite' birds, such as the emu and ostrich, which are found across the southern continents. This group contains some of the world's largest birds - such as the extinct giant moa of New Zealand and elephant birds of Madagascar. ... [A]ncient DNA extracted from bones of two elephant birds held by the Museum of New Zealand, Te Papa Tongarewa, has revealed a close genetic connection with the kiwi, despite the striking differences in geography, morphology and ecology between the two."
Which means that the emu is not, as conventional wisdom has long held, the kiwi's closest link. Here's more on the research
from the University of Adelaide.