What is bipedalism? Give one example of an organism with bipedalism

Bipedalism is a form of terrestrial locomotion where an organism moves by means of its two rear limbs or legs.

(ostrich, human etc.)

Bipedalism, or the ability to walk on two legs, is one of the things that separates humans from apes. Walking on two legs isn't a characteristic exclusive to humans: birds do it, so do kangaroos, and even our closest cousins, the apes, as well as most of the other primates, do it occasionally.