I bet they mean birds, aka modern dinosaurs. This is a good 'aka' because dinosaur made baby dinosaurs who grew up to make their own baby dinosaurs. Each generation was slightly different than the last and after millions of years, the baby dinosaurs were named birds!
Well any dinosaur that existed and flew wasn't actually a dinosaur but rather a pterosaur. However I did a quick spot check and realize that modern day birds didn't evolved from pterosaurs but rather from dinosaurs surprised. So I stand corrected.
And just to emphasize: This is nitpicky, but it is correct. In the phylogenic sense, birds are dinosaurs. It's not that there used to be dinosaurs, some of which evolved into birds and there are no dinosaurs left anymore, but rather there are about 18000 extant dinosaur species in the world today, it's just that they have feathers and most of them fly.
