  == DODO ==  The Dodo's stubby wings and heavy, ungainly body tell us that the bird was flightless. Moreover, its breastbone is too small to support the huge pectoral muscles a bird this size would need to fly. Yet scientists believe that the Dodo evolved from a bird capable of flight into a flightless one. When an ancestor of the Dodo landed on Mauritius, it found a habitat with plenty of food and no predators. It therefore did not need to fly, and, as flying takes a great deal of energy, it was more efficient for the bird to remain on the ground. Eventually, the flightless Dodo evolved.  Scientists at the American Museum of Natural History and other institutions around the world continue to study and document the impact of human activities on the environment. It is hoped that the lesson of the Dodo can help prevent similar extinctions, and aid us in preserving the diversity of life on earth.