Archaeopteryx is known as the earliest and most primitive bird.
Archaeopteryx is said to be considered a link between birds and reptiles, the first bird which changed from a land dweller to a bird.
It was seen in the late Jurassic Period i.e. around 150–148 million years ago.
It had jaws with sharp teeth, three fingers along with claws, a long bony tail, feathers, and several various skeletal features.
It is referred to as a transitional fossil between dinosaurs and birds since it displayed a number of features that were common to both birds and dinosaurs.
Final Answer: Archaeopteryx is a missing link between reptiles and birds.