There are also design similarities between reptiles, mammals and living birds too. So was Archaeopteryx . Much is made of the fact that Archaeopteryx had teeth. Archaeopteryx was not the only fossil bird to have had grasping teeth. Some fossil birds had teeth, some didn't.
Crocodiles are really the only group of reptiles that consistently have very well developed teeth.
And of course even some mammals have teeth and some don't. Some evolutionists have claimed that Archaeopteryx was just a dinosaur plus feathers, in effect. I find that unconvincing for a variety of reasons. The feathers are not just simply applied to the surface of the bird. Where they are attached to bone by ligaments, we see tiny 'bumps'.