If people hadn't seen birds and tried to imitate their flight by inventing airplanes and space shuttles, man would still be earthbound. The loss of a natural species means the loss of a source of inspiration for mankind.
有人說，每個人心中都藏有一隻鳥，身在喧鬧的城市裡，這隻鳥被禁錮起來，當我們回到自然，鳥便展翼翱翔。