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
Basically, fish have vertical tails. Long ago, they started to move onto land and evolved feet over time and eventually into mammals. Then, some of those mammals with feet went back into the water, where over a long time, the feet evolved into horizontal tails.
So, in regards to your mermaids, it stands to believe they are some form of mammal and would have horizontal tails, even though they typically are depicted with fish like scales.
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