List of birds by flight speed
This is a list of the fastest flying birds in the world. A bird's velocity is necessarily variable; a hunting bird will reach much greater speeds while diving to catch prey than when gliding. The bird with the greatest airspeed velocity is the Peregrine falcon, able to exceed 321.8 km/h (200 mph) in its hunting dives. The greatest self-powered horizontal speed is achieved by Homing Racing Pigeons. They can fly 1100 km (700 miles) in a single day, and they have been recorded flying at 177 km/h (110 miles per hour), making them the birds with the fastest speed ever recorded on a self-powered flight, and the fastest endurance flight.
Asiatic cheetah
The cheetah is the fastest land animal in the world. It was previously thought that the body temperature of a cheetah increases during a hunt due to high metabolic activity. In a short period of time during a chase, a cheetah may produce 60 times more heat than at rest, with much of the heat, produced from glycolysis, stored to possibly raise the body temperature. The claim was supported by data from experiments in which two cheetahs ran on a treadmill for minutes on end but contradicted by studies in natural settings, which indicate that body temperature stays relatively the same during a hunt. A 2013 study suggested stress hyperthermia and a slight increase in body temperature after a hunt. The cheetah's nervousness after a hunt may induce stress hyperthermia, which involves high sympathetic nervous activity and raises the body temperature. After a hunt, the risk of another predator taking its kill is great, and the cheetah is on high alert and stressed. The increased sympathetic activity prepares the cheetah's body to run when another predator approaches. In the 2013 study, even the cheetah that did not chase the prey experienced an increase in body temperature once the prey was caught, showing increased sympathetic activity.