What’s the difference between marine animals with a horizontal tail and a vertical one?

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This is for a book I’m writing where mermaids and sirens are more of a natural plausible predators instead of magic, so i more want to know the movement of a animal having a certain tail aswell as the possibility of a mammal having it.

In: Biology

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Anonymous 0 Comments

One intuition is that fish tails are really tails, like dog tails or cat tails, so they have tail-style muscles attached to them that move them in tail-style ways. But whale tails aren’t really tails, they’re legs-and-feet that are acting like tails ‘cuz the evolutionary path was easier that way.

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