I mean fish tend to swim with their top facing the surface and their bottom facing the sea floor. I know it aligns with gravity, but why? Is there no advantage to living your life upside down or vertically?
In: 6
Quick answer : they are used to it, and it works.
Species won’t change habits if it doesn’t give an advantage.
Long answer : https://www.smithsonianmag.com/science-nature/why-dont-fish-swim-upside-down-180967192/
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