Why do fish have vertical tail fins and whales have horizontal

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Kinematic and hydrodynamic function of dorsal and anal fins during

Natural History Magazine

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

Whale Shark

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

Homology or convergent trait?

How to tell the difference between a shark and dolphin by their fins

Is It a Surprise? Humpback Whales! – Whales and Dolphins BC

Why do marine mammals sway their tails vertically, while fish sway them horizontally? - Quora

Tails you win Sussex Wildlife Trust

Are there any particular advantages to fishes' tails being vertical and whales' flukes being horizontal? - Quora

Flying Fish

Why do whales have horizontal tails, while other fish have vertical tails? Is there any aquatic animal that has a combination of them (similar to aircraft empennage)? - Quora

Ask Dr. Universe: Evolution gave marine mammals horizontal tails

Is It a Surprise? Humpback Whales! – Whales and Dolphins BC