But what is unique to evolution is the amount of imagination that is used. All you have here is a bird.
-Towerwatchman
No imagination necessary my friend. There are multiple lines of evidence showing that Archeopteryx is more than just a bird:
1.) All modern birds have beaks or bills. The Archeopteryx, however, does not have a beak. Instead, it has a jaw.
2.) The spinal cord in modern birds attaches underneath the skull. In Archeopteryx, the spinal cord attaches to the back of the skull (like all other reptiles).
3.) The thoracic vertebrae in modern birds is always fused. In Archeopteryx, the thoracic vertebrae are free.
4.) Modern birds have a saddle shaped cervical vertebrae. Archeopteryx has a cervical vertebrae with conclave vertical facets (much like Tarbosaurus).
5.) Birds have short articulating ribs. The Archeopteryx, however, has long ribs that do not articulate.
6.) Birds do not have a gastralium. Archeopteryx, like all reptiles, does.
7.) Birds metacarpals (hand bones) are always fused. But the metacarpals of Archeopteryx, like all reptiles, are free and flexible.
8.) Birds have 11 to 23 vertebrae in the sacrum (the vertebrae that run through the pelvis). The Archeopteryx has only six bones in it's Sacrum (the same number as in reptiles).
9.) Birds have an elongated pubis that angles backward. The pubic shafts of Archeopteryx is short and not angled backward.
10.) Birds have a short tail with the vertebrae at the end fused into a pgostyle. The Archeopteryx has a long boney tail with many free vertebrae up to the tip.
There are many other differences too that put the Archeopteryx is more than just a bird.