Birds are dinosaurs. Thomas Huxley’s wild avian speculation in the 19th century was quickly shelved in favor of “dinos were cold-blooded, slow-moving reptiles.” It wasn’t until the 1990s (!) that it was conclusively established that there had been feathered non-avian dinosaurs, that feathers evolved before flight, and that modern birds aren’t descended from dinosaurs, but are in fact the only surviving lineage of theropod dinosaurs.