Archeopteryx is a transitional form between reptiles and birds. It is related to reptiles by the presence of a long tail, teeth on the jaws, three free fingers with claws on the wings, movably connected trunk vertebrae, the absence of air cavities in the tubular bones of the extremities. With birds, achreopteryx is brought together by the presence of a feather cover on the skin, the front limbs that have turned into wings, saber-shaped shoulder blades, clavicle spliced into a fork. The structure of the extinct Archeopteryx testifies to the origin of birds from ancient reptiles. However, the ancestor of birds has not yet been found.
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