Human Sperm Swim Like 'Playful Otters,' New Study Finds - HuffPost

At the time, van Leeuwenhoek described his sperm cells as “animalcules” and observed that the sperm tail, “when swimming, ...

“Human sperm figured out if they roll as they swim, much like playful otters corkscrewing through water, their one-sided stoke would average itself out, and they would swim forwards,” Gadelha said, calling this corkscrew method of movement “a swimming technique to compensate for their lop-sidedness.”.

“The sperm head spins at the same time that the sperm tail rotates around the swimming direction