By 
Lauren Sallan
 | 
TED-Ed Original

Why are fish fish-shaped?

In tropical seas flying fish leap out of the water gliding for up to 200 meters before dipping back into the sea. In the Indo-Pacific a hunting sailfish swims up to 110 kilometers per hour. These feats are made possible by a fish's form—which in most species is a smooth long body fins and a tail. Lauren Sallan explains why these features are so common and what it reveals about fish.

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