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

humpback whales – Marine Education and Research Society

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

Ask Dr. Universe: Evolution gave marine mammals horizontal tails

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

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

Fish Farmer March 2024 by Fish Farmer Magazine - Issuu

Ask Dr. Universe: Evolution gave marine mammals horizontal tails

Marine Education and Research Society – Conducting scientific research and providing education in order to promote conservation and understanding of marine ecosystems.

Why did all marine mammals evolve to have horizontal tail fins while all(?) fish evolve to have vertical ones? : r/askscience

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