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
Think airplanes – a big whale dont need to move very fast. So they can just geently move their big – but heavy, horizontal fins slowly and that gives them forward motion for a certain amount of energy. A fighter jet (shark) needs speed – so they have as little resistance as possible, but also need to exert a lot more energy to get to those speeds.
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