The average person swims at a speed rarely exceeding two miles per hour, or 3.2 km/h. A fit, young, and fully trained Olympic swimmer fares much better, with speeds of up to five mph (8 km/h) not ...

Speed in the animal kingdom comes in many forms, from powerful land sprints to lightning-fast dives beneath the waves. Whether it's in the air, on land, or through water, each species has evolved in ...