Peregrine falcons (Falco peregrinus) are the fastest birds on earth. they usually fly at 65-90 kph but they can fly faster when they hunt. Their highest speed is about 325 kph. they hunt other birds-usually ducks and pigeons. Their wings are about 120 cm long. Their body is about 34-58 cm long. They weigh about 1 kg. You can see peregrine falcons in most countries. They can lie in very cold and very hot places.