available128912365578436cove12891Big Birds Can't Fly Sir David Attenborough explains how some birds thrive despite their inability to fly. It may seem strange that among the more than 10,000 bird species in the world today is a group that literally cannot fly or sing, and whose wings are more fluff than feather. These are the ratites: the ostrich, emu, rhea, kiwi and cassowary. How and why these birds abandoned flight has puzzled scientists since Darwin’s time, but DNA and dedicated research are helping to solve these mysteries. 2015-10-07 20:00:00publish2015-11-08 00:30:00November 8, 2015disabledshowfalse12847Cheetahs Chase Down OstrichOstriches are fast, but cheetahs are faster. 2015-10-07 00:00:00http://www.pbs.org/wnet/nature/files/2015/10/mezzanine_635-480x270.png2365561652cove12848Baby Ostriches HatchingMoments after they hatch from the egg, baby ostriches are ready to get up and go. 2015-10-07 00:00:00http://www.pbs.org/wnet/nature/files/2015/10/mezzanine_867-480x270.png2365561679cove
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Sir David Attenborough explains how some birds thrive despite their inability to fly.