Most Hamar cattle have their ears serrated.The semi-nomadic Hamar of Southwest Ethiopia embrace an age-grade system that includes several rites of passage for young men. The most elaborate of them and the most important is the 'Jumping of the Bull' ceremony when a youth attains full manhood and is permitted to marry. The climax of the ceremony in when the initiate leaps onto a line of ten or more of his family's bulls and runs along their backs; he must complete the feat twice in each direction.