'Far from crazy, feathered dinosaurs have become a well-established fact, thanks largely to a trove of remarkable fossils that have been unearthed in northeast China since the mid-1990s. Now Dr. Brusatte and other paleontologists are trying to determine exactly how feathered dinosaurs achieved powered flight and became the birds that fly overhead today — an evolutionary mystery that stretches more than 150 million years.'
@Carl_Zimmer

https://www.nytimes.com/2023/06/03/science/bird-flight-evolution.html