Scientists recently discovered that the small dinosaur named “Zheng's Xiaoting Dragon” is a “relative” to the Archaeopteryx, which is very close to the Archaeopteryx that lived in the Late Jurassic. The phylogenetic relationship of the early birds was reanalyzed and it was found that the archaeopteryx was not a bird, but the original Deinonychus, that is, the archaeopteryx was the ancestor of the raptor, not the ancestor of the bird. If the following are true, the above speculations cannot be questioned:. ['Deinonychus is a class of birds closely related to dinosaurs.', 'Deinonychus is a group of dinosaurs that are closely related to birds.', 'A theropod dinosaur evolved into a herbivorous dinosaur and then into a bird.', 'Archaeopteryx specimens have been considered the most primitive and oldest birds ever since they were named.']