Every animal speed in a book is a record of some kind. Some records are better than others. People who time animals cannot always catch their fastest speed. Animals do not always run flat out when someone is measuring. So a number can be a good measurement, or it can be a rumor that people keep repeating.

Many books say a sailfish can swim 68 mph. That number came from a Florida fishing trial in the early 1900s. A hooked sailfish reportedly pulled out line in three seconds. As of November 2026, it is a story about a fishing line, not a clean measurement. It shows how a speed can travel from book to book.

A trained peregrine falcon named Frightful was reportedly clocked at 242 mph in a dive in 1999. As of November 2026, the peregrine is the fastest animal in the world. Its record speed is in a dive, not on level ground. A dive like this is called a stoop.

On the ground, the cheetah is the star. In the best field measurement of wild cheetahs, the top speed was 58 mph, as of November 2026. A cheetah can hold its top speed for only about 20 to 30 seconds. So a short sprint is the right way to picture it.

The air held a surprise. A 2016 study of wild Brazilian free-tailed bats found ground speeds of about 100 mph. That was faster than any bat or bird measured before, as of November 2026. Ground speed is how fast an animal crosses the ground below it.

Some animals are known for distance, not only speed. Some peregrines migrate as far as 15,500 miles in a year. They fly from Arctic nesting grounds to South America and back. Peregrines also live in cities. They nest on tall buildings and bridges as well as on cliffs. A record holder can be close to home.

Speed can mean a short burst or a long dash. Usain Bolt ran 100 meters in 9.58 seconds in 2009. His fastest stretch was about 27.8 miles per hour, between the 60 and 80 meter marks, as of November 2026. Before anyone trusts a fast number, a good question is who measured it, and how.

Words to know

• migrate: travel far
• clocked: timed
• measurement: a counted size
• Arctic: far north