The discovery of the fossilized remains of Archaeopteryx in 1860 led to the beginning of the hypothesis of birds being closely related to:

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The discovery of Archaeopteryx, which had both bird-like and reptilian features, suggested a close evolutionary relationship between birds and dinosaurs. Further studies and discoveries have since provided strong evidence for this hypothesis, including similarities in skeletal structure and DNA sequences.

The Discovery of the Fossilized Remains of Archaeopteryx in 1860