Scientists have discovered the remains of a giant bird-like dinosaur, which is around the same size as a tyrannosaur at 5 metres tall. The discovery indicates a more complex evolutionary process for birds that what was originally known.

Gigantoraptor Elrianensis also had a beak, slender legs and likely had feathers. Mark Norell, curator of paleontology at the American Museum of Natural History said:

"It's one of the last groups of dinosaurs that we would expect to be that big" and it shows "how little we know about the diversity in the dinosaur world".

The creature is estimated to have walked the Earth around 70 million years ago.

Photos credits: Claro Cortes IV/Reuters; Institute of Vertebrate Paleontology & Paleoanthropology/Associated Press.