Cheetah

Built for one speed

A cheetah can accelerate from 0 to 100 km/h in about 3 seconds and reach top speeds of 110–120 km/h, faster than any other land animal. Almost every part of its body is engineered for the sprint:

• Lightweight skeleton — fewer bones, thinner ribs.
• Long legs and flexible spine — the spine bends and unbends like a bow at full gallop.
• Semi-retractable claws — provide running grip like cleats.
• Large nostrils, lungs, and heart — to feed muscles with oxygen at peak.
• Long tail — used as a counterbalance and rudder during sharp turns.

Top-speed sprints last only 20–30 seconds before the cat overheats; a cheetah can’t physically chase prey for long.

Not a typical big cat

Cheetahs are big cats by family but unusual in many ways. They can’t fully retract their claws (unique among felids), can’t roar (the larynx is shaped wrong), and instead chirp and purr. They hunt by day, while most big cats are nocturnal — partly to avoid lions and hyenas that would steal their kills.

Vulnerable, increasingly so

Cheetah populations have collapsed from an estimated 100,000 in 1900 to about 7,000 today, distributed across fragmented African habitats and a single tiny Iranian population. Threats include habitat loss, illegal pet trade (especially cubs from the Horn of Africa to the Gulf states), persecution by livestock farmers, and a low genetic diversity that makes the species susceptible to disease.

Genetic bottleneck

All cheetahs alive today descend from a small ancestral population that nearly went extinct around 10,000 years ago. The genetic similarity is so high that skin grafts between unrelated cheetahs aren’t rejected by their immune systems — a level of similarity normally seen only in identical twins. This bottleneck has consequences: cheetahs have notably high rates of disease and infertility, complicating conservation breeding programs.