This article by Sean B. Carroll tells the story of the search for and discovery of Tiktaalik, an animal with a mix of fish and tetrapod features—a fishapod! It supplements the short film Great Transitions: The Origin of Tetrapods, starring Neil Shubin.
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929Click & LearnGreat Transitions InteractiveThe fossils of transitional creatures were key evidence for Darwin’s evolutionary theory, but none had been found when he published On the Origin of Species. Now, there are many examples of such fossils, which clearly show that big evolutionary leaps consist of many smaller steps.