https://www.newscientist.com/article/2183633-dinosaur-fossil-may-be-a-whole-new-species-of-the-first-birds/

Archaeopteryx was first recognised as a species in the 1860s. It was immediately seized on as evidence for Darwin’s theory of evolution, because it appeared to be a bird with dinosaur-like traits. It had wings and feathers, but teeth instead of a beak. The obvious implication was that Archaeopteryx was a transitional fossil, showing how birds evolved from dinosaur ancestors.

It was about the size of a raven and may have had black feathers. It’s been suggested that it only flew in short bursts like a pheasant, and hunted at night.