The hypothesis that birds are closely related to small dinosaurs called theropods began with the discovery of the fossilized skeleton of Archeopteryx.

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The discovery of the fossilized skeleton of Archeopteryx in the late 1800s was one of the earliest pieces of evidence suggesting that birds evolved from theropod dinosaurs. Since then, numerous other fossil discoveries have provided further support for this hypothesis.

The Hypothesis That Birds Are Closely Related to Small Dinosaurs