Bulls have horns, lions have manes, and baboons have rainbow noses and really vicious teeth.
Until recently, it was the cell phone. As it turns out, the men were using them to attract mates. That in itself is interesting, but even more so was the male behavior observed in a busy upper-income English pub over 23 evenings by researchers John Lycett and Robin Dunbar of the University of Liverpool. In the current issue of Human Nature, the pair report that they found that men with cell phones tend to take them out of their pockets and place them on the bar or table upon arriving. They handle them often, not so much to make or take calls, but to call attention to the fact that they have one, Lycett said.