The living Earth (except a few times when I pin dead stuff) --- Sinosauropteryx: The first genus of dinosaur outside of Avialae (birds and their immediate relatives) to be found with evidence of feathers. Which can be seen clearly in this gorgeous fossil.
Archaeopteryx Berlin specimen is considered the most famous fossil in the world. It is about 150 Ma & was discovered in limestone deposits in Eichstaett, Bavaria. Archaeopteryx has bird flight feathers, but also has reptile features such as a tail bone &
Paleobirding: What Birds Looked Like 125 Million Years Ago
Transitional fossil: Sinosauropteryx prima: one of the best preserved dinosaurs found; bristly structures on neck, back, flanks, tail thought to be primitive feathers; represents evolution of feathers between dinosaurs w/o feathers and Archaeopteryx