Roan antelope are one of the largest species of antelope.They form harem groups of five to 15 animals with a dominant male. Roan antelope commonly fight among themselves for dominance of their herd, brandishing their horns while both animals are on their knees.Females breed at two years, calve at three years, and thereafter produce young at roughly 10.5-month intervals (gestation 9–9.5 months). After a 2–3 week hiding stage, calves join the maternal herd, where they associate with other juveniles in creches. Resting juvenile subgroups are often left behind when the rest of the herd moves, making them vulnerable prey for leopards. However, roan have been known to kill lions that failed to overpower them immediately. Their curved horns and a sideways stabbing technique, together with an aggressive temperament, make the roan antelope unusually formidable.