Stock Photo - ´Four-winged dinosaur.  Artwork of Microraptor gui, a  gliding  dinosaur  with  feathers  on  all four limbs,  which lived in the early Cretaceous period about  130  million years ago.  This tiny dinosaur was  only  about  70  centimetres  long.   It   is classified   as   a member  of  the  dromaeosaurid family. Its discovery provides  evidence  that birds  evolved  from  a gliding ancestor, rather than a fast-running ground-dweller.   However, it may not be a direct ancestor of modern birds.