Ancestors of ostriches and emus were long-distance fliers: Study
Ancestors of modern-day flightless birds like ostriches, emus and kiwis were capable of flying and may have crossed oceans by air to spread across continents, according to study published in Biology Letters. Researchers analysed fossils of Lithornis promiscuus, early ancestor of flightless birds, and suggested it flew either by continuous wing beats or by alternating between flapping and gliding.