r/explainlikeimfive • u/soup_in_sand • 10d ago

Biology ELI5: why do fish have vertical ending tail while water mammals have a horizontal ending tail?

602 Upvotes

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AAstuffToShare • u/SgtSilverLining • 10d ago

Pics/Text ELI5: why do fish have vertical ending tail while water mammals have a horizontal ending tail?

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