TOKYO -- If you think of dinosaurs as nothing more than giant lizards, it is time to reboot your imagination. A new picture is emerging of the evolution of these ancient beasts, and it seems the old assumptions were off the mark.

New research into the structure of dinosaur bones, like the ones shown here at Japan's National Museum of Nature and Science, shows they were not the lumbering giants once thought.
TOKYO -- If you think of dinosaurs as nothing more than giant lizards, it is time to reboot your imagination. A new picture is emerging of the evolution of these ancient beasts, and it seems the old assumptions were off the mark.