Researchers have known that an animal swimming parallel to a solid surface receive a subsequent boost in performance, thus allowing them to utilise less energy when moving around.
Studies have quantified this into a 25 percent increase in speed and a 45 percent increase in thrust when swimming near a solid surface.
However, the jellyfish does not swim near the seafloor or seawalls. How does it get named the "world's most efficient swimmer"?
Apparently, it does so by creating a "virtual wall."