A biped is an organism that moves using two legs. This type of locomotion is common among many species, including humans and birds. Bipedalism allows for efficient movement and the ability to cover ground quickly, which can be advantageous for escaping predators or searching for food. In the animal kingdom, bipedalism is seen in various forms. For example, humans walk upright, while kangaroos use their strong hind legs for hopping. Some dinosaurs, like the Tyrannosaurus rex, were also bipeds, showcasing the diversity of this mode of movement across different species.