That's why it's an intermediary between dinos and birds.<quoted text>
YOU learn to read and comprehend together like a human being is supposed to be able to do. This is what the article says...
"Modern birds—or avian dinosaurs—share a different set of traits, such as hollow bones and rapid growth, than those exhibited by their prehistoric predecessors."
IOW.. Modern birds HAVE a DIFFERENT set of traits, including hollow bones than their predecessors, eg Arch. In my other article ARCH HAS A DIFFERENT GROWTH RATE TO BIRDS and LIKE DINOSAURS.
ARCH DID NOT HAVE HOLLOW BONES, you and the rest of the gaggle of geese! Nor did it have a furcula that looked anything like a modern bird, nor are feathers solely an avian trait, nor are dino beaks, and the entirely of evolutionary theory is based on ROT, yet my 6 points stand strong.
For a dino to evolve into a bird it has to loose some features and gain others. In between we will find animals with a mix of both and that's what the article is describing.