What is the definition of human beings?

A human being is a homo sapien. Humans are mammals, related to the ape family, but with our larger brains, the most developed animal on planet Earth. We also have a distinctly more upright posture, and are one of the only habitual bipeds in the animal kingdom (the other main group being grounded or Flightless Birds). The phrases 'human being' can refer to either a man, woman or child, of any age, race or nationality.