Add Yahoo as a preferred source to see more of our stories on Google. Courtesy Gilberto Sanchez Other than humans and kangaroos, birds are the only animals that rely exclusively on two legs, not four, ...

Many organisms can transition smoothly from one mode of locomotion to another, often by using the same body parts. For example, flying fish use their fins to steer underwater, and these same ...

Birds have impressive balancing skills. Learn how birds stand on one leg and stay upright even while they're sleeping.