Groupings of females and young vary greatly in size.
Herds of 50-100 are quite common, usually with one dominant bachelor male.
Mature males alternate between bachelor and territorial status and rarely hold a territory
for more than a few months at a time. This image, taken in the Serengeti National
Park, shows two immature females in an episode of head butting, a common activity among
these grazing and browsing bovids.