The fastest bird in the world is the peregrine falcon. It is known to dive towards its prey from a height of more than one kilometre at speeds reaching up to 389 km/h. The falcon’s streamlined body, strong wings, and sharp talons make it an efficient predator in the animal kingdom. Other fast animals include cheetahs, sailfish, and marlins, which can all reach speeds of more than 100 km/h. However, the peregrine falcon remains unrivaled as the fastest animal with its incredible diving speed.