Is it more likely that merfolk would evolve with horizontal or vertical tails?
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Another mermaid questions I'm afraid!
Fish have tail fins which are vertical, whales have fins which are horizontal. My race of merfolk are:
- Very active (more likely to be warm blooded)
- Have gills and lungs so can breath in and out of water
- Have scaled tails (like a fish) and human-like skin on their top half (although thick to avoid the chill of the water).
Is it more likely that such a race would evolve with a horizontally or vertically orientated tail? What are the advantages of both?
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