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The fact is, Archaeopteryx was not a bird-like dinosaur; Archaeopteryx was a bird -a perching bird. Period.
Archaeopteryx was NOT a perching bird, but this is an understandible being that it comes from a recent specimen which shows that it does not have a reversed hallux, which is the opposing talon feature allows birds to perch. Since it wasn't a perching bird, it was probably a runner like dromeosaurids (velociraptor) which is the dinosaur group to which archaeopteryx is most closely aligned. There are several features of archaeopteryx that place it with dromeosaurids, among them is the hyperextendible second toe, which is only found in dromeosaurids. If archaeopteryx fossils didn't show feathers we would have thought they were just another small dinosaur, that's how much like a dinosaur it is. If archaeopteryx isn't transitional then there is no such thing, since it is a near perfect mosaic of dinosaur and avian traits.
The fossil evidence for several transitions is very good; fish-amphibian (eusthenopteron, tiktaalik, acanthostega), reptile-mammal (dimetrodon, thrinaxodon, probainognathus), whale (pakicetus, rodhocetus, basilosaurus), horse (hyracotherium, mesohippus, miohippus), and last but not least we have an excellent fossil record (australopithecus afarensis, homo erectus, paranthropus boisei).