Four-Legged Duck-Billed Platypus Found in Montana...But Where is the Now Public Dinosaur?

-- Leonardo died young, just three or four years old. But he would be remembered, even down to his last meal's menu items (leaves). A four-legged duck-billed dinosaur, Leonardo was discovered in his 20-foot-long splendor in the Montana badlands in 2000, about 77 million years after his life was cut short. Now a Discovery Channel special, "Secrets of the Dinosaur Mummy," gets up-close-and-personal to profile this young Brachylophosaurus. Skin impressions and fossilized samples of the digested food still inside Leo's abdominal cavity, plus skin and joints, have allowed scientists to create the first reconstruction of a giant dinosaur, theoretically accurate both inside and out. But that's just the beginning of what Leonardo can convey about a world long past. Better late than never. The documentary airs Sunday at 9 p.m. EDT.