The cheetah (Acinonyx jubatus) is the fastest land animal on Earth. In short bursts, it can accelerate from 0 to 100 km/h in just 3 seconds and reach a top speed of approximately 120 km/h — faster than most sports cars. This extraordinary speed comes at a cost: a cheetah can sustain a sprint for only 20 to 30 seconds before it must stop to recover, its body temperature rising dangerously.
Unlike most big cats, cheetahs are built more like greyhounds than powerhouses. Their lightweight frame, long legs, flexible spine, enlarged heart and lungs, and semi-retractable claws — which act like running spikes — all contribute to their unrivalled speed. During a sprint, a cheetah's stride can cover up to 8 metres, and for a brief moment at top speed, all four paws leave the ground simultaneously.
Cheetahs hunt during the day, using their exceptional eyesight to spot prey from up to 5 kilometres away. They stalk to within 60–70 metres of their quarry before launching a high-speed chase. After a successful kill, a cheetah must rest for up to 30 minutes before eating, during which time it is vulnerable to having its meal stolen by lions, leopards, or hyenas.
Cheetahs are the most endangered of Africa's large cats, with fewer than 7,000 individuals remaining. Their low genetic diversity — a consequence of a severe population bottleneck around 10,000 years ago — makes the species highly susceptible to disease and reduces reproductive success.