Nutcracker Man ate grass

The following report shows the result that Paranthropus boisei as "Nutcracker Man" (between 1.4 million and 1.9 million years ago) actually chewed grasses instead.

• Cerling, T. E., Mbua, E., Kirera, F. M., Manthi, F. K., Grine, F. E., Leakey, M. G., Sponheimer, M. & Uno, K. T. 2011. Diet of Paranthropus boisei in the early Pleistocene of East Africa. Proceedings of the National Academy of Science (PNAS). doi: 10.1073/pnas.1104627108