They bounce stiff-legged with all four legs landing together. This may communicate alarm, give them a better view of predators, and also may confuse or even intimidate predators. Like most true antelope the tommies have facial and leg glands for territorial marking and species recognition. It is the least drought tolerant of all the gazelles. Gazelles breed seasonally so that births coicide with grass growth in spring.
Females go off on their own to give birth.
Fawns lie out for the first few weeks of life. Once they can run well, the fawn and mother rejoin the group. They may breed twice a year. The chief predator of the gazelle is the cheetah. Flight is their chief defense.