Which animal is the fastest?

Speed supremacy depends on the domain. In the air, the peregrine falcon reaches 389 km/h (242 mph) during its hunting stoop (dive), making it the fastest animal on Earth. On land, the cheetah accelerates from 0 to 97 km/h in just 3 seconds and hits a top speed of about 112 km/h (70 mph), but can only maintain this for 200–460 meters before overheating. In the water, the black marlin is the fastest fish at approximately 132 km/h (82 mph). The pronghorn antelope is the fastest sustained runner, maintaining 88 km/h for extended distances — it evolved to outrun the now-extinct American cheetah. Among insects, the Australian tiger beetle runs at 9 km/h — equivalent to a human running at 770 km/h relative to body length.