Why do fish have vertical tail fins and whales have horizontal ones? - BBC Science Focus Magazine

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What is the evolutionary reason that explain why marine mammals have horizontal tail fins and fish have vertical tail fins? - Quora

science based - Is it more likely that merfolk would evolve with horizontal or vertical tails? - Worldbuilding Stack Exchange

science based - Is it more likely that merfolk would evolve with horizontal or vertical tails? - Worldbuilding Stack Exchange

Why do aquatic mammals like dolphins and whales have horizontally oriented tail fins while fish have vertically oriented ones? - Quora

How Language Works- Mike Gasser - Flipbook by Kenali Mali

What is the evolutionary reason that explain why marine mammals have horizontal tail fins and fish have vertical tail fins? - Quora

Why do some fish have vertical tails, and others have horizontal tails? - Quora

What is the evolutionary reason that explain why marine mammals have horizontal tail fins and fish have vertical tail fins? - Quora

Why do aquatic mammals like dolphins and whales have horizontally oriented tail fins while fish have vertically oriented ones? - Quora

humpback whales – Marine Education and Research Society

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Why fish have vertical fins, and dolphins and whales not? — Steemit

Why do aquatic mammals like dolphins and whales have horizontally oriented tail fins while fish have vertically oriented ones? - Quora

zoology - Why is there a difference in the rotation of the tail fin in fish compared to marine mammals? - Biology Stack Exchange