Thomson's gazelle (Gazella thomsonii)

Identification and characteristics

Thomson's gazelles are relatively small compared with some other African antelopes. Typical field features include:

• Coat: a reddish-brown upper body, white underparts and rump, and a bold dark lateral stripe along the flank that contrasts with the paler belly.
• Horns: both sexes usually bear horns, though male horns are thicker and ringed; female horns are shorter and more delicate.
• Build: a slender, lightweight frame suited to quick bursts of speed and sudden changes of direction.
• Distinctive traits: facial markings and the black flank stripe help distinguish it from similar species such as the larger Grant's gazelle.

Behavior, diet and ecology

Thomson's gazelles are primarily grazers, favouring short grasses, but they may browse when grass is scarce. Social structure varies with season and local conditions: females and their young often form herds, bachelor groups are common, and territorial males may hold small areas where they court and defend females. When threatened, gazelles rely on speed and agile leaps; they may also show conspicuous stotting or pronking behaviour that can signal fitness to predators.

History, name and human connections

The species is named after the 19th-century explorer Joseph Thomson, hence the colloquial name "tommie." Thomson's gazelles have long been an iconic part of East African wildlife scenes and the annual movements of grazing herds. They are tolerant of some forms of human presence and are sometimes found on ranches and farmland, though they fare less well where habitat is heavily modified or fenced.

Conservation and notable facts

While still widespread in parts of its range, Thomson's gazelle populations face pressures from habitat conversion, fencing, livestock competition and illegal hunting. Conservation efforts include protected areas and management on private lands. Predators such as cheetahs, wild dogs, lions and hyenas make the gazelle an important prey species in savanna ecosystems, influencing predator behaviour and the structure of mixed herds.

For further general information see resources on gazelles and small antelopes: gazelle overview, antelope groups, and regional guides to East African wildlife East Africa.