In African plains, you often see warthogs. They stay in families or small groups and trot one behind the other in a straight line. They have long, thin tails with a black tuft of hair at the end. They hold their tails straight up behind them. The tufts act like tiny flags. They help a warthog family stay together. The black tuft also serves as a warning signal in case of danger. So what happens when Little Warthog cannot hold up its tail?