Information Cheetahs evolved much earlier than other large cats, arising from a cat-like mammal that lived about 4 million years ago. Their bodies are different then lions, tigers, and other cats in many ways. Cheetah claws don't retract like other cats This is because the cheetah needs the extra traction during high-speed sprints. Cheetahs don't growl! They hiss or emit a bird-like chirp. They don't didn't evolve the vocal ability to roar. Cheetah bodies are specifically built for speed. Their small head offers very little wind resistance, while their exceptionally long legs allow them to take huge strides. During sprints, the cheetah spine acts like a giant spring, storing energy that can be released in explosive surges. And the cheetah's enlarged heart, lungs, and liver help deliver bursts of oxygen and energy. Don Person, a Dutch biologist who studies cheetahs in East Africa say that because of this, "They are speed demons."

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