TED-ED: Why are fish fish-shaped? - Lauren Sallan

The video explores the diverse motion mechanisms in fish, highlighting their evolutionary adaptations. Fish are categorized into two main groups based on their motion: body and caudal fin driven, and median and paired fin driven. The former group includes species like eels and tuna, which use their bodies and tails for propulsion. The latter group, including rays and reef fish, relies on fins for movement. The video also discusses outliers like seahorses and pufferfish, showcasing the evolutionary success of these adaptations across thousands of species.

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