What’s the fastest animal on Earth? Depends on how you define quickness. By simple miles per hour, classic megafauna like cheetahs dominate the leaderboard. But if we measure velocity by the body lengths an animal travels per second, those quick cats have some competition. This race of proportions allows contenders from all kingdoms to go for gold. Here’s how a cross-section of critters achieves top speeds.
https://www.popsci.com/fastest-animals