Flight
Animals have evolved a number of ways of navigating the Earth, including walking, swimming, climbing and hopping. But the evolution of flight, the No. 2 adaptation in our countdown, takes maneuvering on this planet to a higher level. Flying not only delivers an animal from one place to another much faster than lumbering along with a pair of legs, it also allows creatures to escape predation, explore new territories and look for resources that might otherwise be out of reach. And although we rely on machines rather than our own anatomical abilities in the air, being able to fly has certainly transformed human society..