In contrast, infants of Paranthropus
robustus, that became extinct around one million years ago and were a more robust species in terms of dental anatomy, as well as infants of Australopithecus africanus, stopped drinking sizeable proportions of mother milk in the course of the first months of life.
1938 Schoolboy Gert Terblanche discovers fossils of an unknown 'robust-type' human ancestor, later named Paranthropus
robustus by Robert Broom, at Kromdraai, Blaauwbank River Valley, South Africa.
Specifically, they studied an ancient hominin called Paranthropus
, who lived some two million years ago, and found that its cranium was much thinner and composed of a compact bone, rather than spongy one.
In comparing this cranium to that of another extinct group of our family tree, Paranthropus
, that lived in South Africa along with the first humans less than two-million-years ago, their study revealed an intriguing and unexpected aspect of the cranial anatomy in this genus.
By 1.7 to 2 million years ago, early humans ate 35 percent grasses and some scavenged meat from grazing animals, while another nearby hominin, Paranthropus
boisei, was eating 75 percent grasses, including wheat.
Protostylid expression at the enameldentine junction and enamel surface of mandibular molars of Paranthropus
robustus and Australopithecus africanus.
One JUTTING JAW: was Paranthropus
, with a small brain, large teeth and strong jaw.
 examined the endocasts of Australopithecus africanus and three species of Paranthropus
. They found that the brain morphology of Australopithecus africanus appears more human like than that of Paranthropus
in terms of overall frontal and temporal lobe shape.
Study author Dr Gabriele Macho examined the diet of Paranthropus
boisei, nicknamed "Nutcracker Man" because of his big flat molar teeth and powerful jaws, through studying modern-day baboons in Kenya.
(1986): Dental evidence for dietary differences in Australopithecus and Paranthropus
: a quantitative analysis of permanent molar microwear.
robustus, and Australopithecus africanus to analyze the size and shape differences for interpretation of phylogenetic relationships between the taxa.
Leakey also discovered the Zinjanthropus (Paranthropus
, a genus of extinct hominins) skull.