"Your Inner Fish" is the first episode of a documentary series about a vertebrae paleontologist named Neil Shubin. The focus of this episode is to discuss how humans evolved from fish. It considers Darwin's common ancestor theory and talks about how the same basic structure of forelimbs exists in mammals and their fish-like ancestor that they also share with birds and reptiles. There are significant similarities between the human embryo and the fish embryo. The portion of the human embryo that corresponds to gills, or what will be gills, in the fish embryo, forms the lower jaw, middle ear, and voice box in humans, and this represents the changes that evolution has brought about. A gene called hedgehog tells cells how to things in a specific order depndeing on how close they are to a specific signal. Tiktaalik is the missing link in the line of evolution between fish and humans that paleontologists have been searching for, as it has the same forelimb pattern as humans.
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