"Nonavian dinosaurs" refers to all dinosaurs that are not birds. It includes the various types of dinosaurs that lived millions of years ago and became extinct, such as the Tyrannosaurus rex or the Brachiosaurus. Full definition
The strange new species is the first known nonavian dinosaur that could both run and swim, researchers say. (sciencenews.org)
It seemed so obvious that if fairly small changes in development, which adjusted the timing and concentrations of growth and signaling factors, could have led to the evolution of birds from nonavian dinosaurs, we could readjust those changes in development and get a dinosaur from a chick embryo. (discovermagazine.com)
Cretaceous 65 million years ago; decimated nonavian dinosaurs as well as marine reptiles and numerous species of marine organisms. (discovermagazine.com)