"Paranthropus" did not behave in the same way as "Homo". They lived on a diet of heavy-duty plant material: leaves, slim branches, grass, roots. The diet might be supplemented with insect grubs. Lacking our flexible behaviour, "Paranthropus" relied on the steady environmental conditions of the tropical forest. Members of the genus "Homo", such as "Homo habilis", had proportionately larger brains and more flexible behaviour. They were able to eat a much wider variety of foods.