"There's a mammal called a pangolin that has scales all over its body."
Yup, and there are several mammals that lay eggs, too. The pangolin looks something like those old extinct mammals that nobody pays much attention to.
The American Museum of Natural History has an entire room of huge, bizarre mammal fossils. It's an interesting look into the not so distant past.
Maybe an even better point. Those monotremes are in the mammal group but their line branched off on its own way back there.
What we're doing is learning more about the early history of the coelurosaur taxon. More data points should help to tell a more coherent story.
The Smithsonian has a bunch too. I especially like the glyptodons, huge armadillos that may have been hunted to extinction because people used their shells as **shelters**.