Mouse sperm parties make for straight swimmers

Instead of boosting speed, grouping helps male reproductive cells travel in a uniform direction

SPERM CREW  Traveling in a straight line comes easier for groups of sperm than for solo swimmers in two mouse species. 

© James Weaver/Wyss Institute/Harvard Univ.

Mouse sperm shoot along straighter paths by ganging up. Yet the merits of forming flocks evaporate if the group becomes too large, researchers report July 22 in the Proceedings of the Royal Society B.