They say an elephant never forgets. But a more accurate adage would be that an elephant never sleeps—or, hardly ever. Tracking two wild elephant matriarchs for a month revealed that they averaged only a couple of hours a night. On some nights they surprised researchers by never going to sleep at all. This might make them the most wakeful mammals in the world.
The sleeping habits of large mammals are a “contentious” subject, says Paul Manger, a professor at the University of the Witwatersr