A single-celled protozoan may actually be a lot faster than cheetahs, marlins or peregrine falcons.
Conservationists have warned that the world's fastest land animal is on the verge of being wiped out.
Researchers at MIT have developed a robotic cheetah capable of leaping effortlessly over objects.
The DARPA funded project has produced a quadrupedal robot that is able to run like a cheetah.