Synopsis

The world boasts over ten thousand bird species, yet within this vast array exists a peculiar group – flightless and mute, their wings composed more of down than of feather. These are the ratites: ostrich, emu, rhea, kiwi, and cassowary. Since Darwin first pondered the question, scientists have been captivated by how and why these birds relinquished the power of flight. Now, advances in DNA analysis and focused research are beginning to unravel these enduring mysteries.