Was the common ancestor of the two chimp species more like the common chimpanzee or more like the bonobo (or perhaps in-between)?
The lineages leading to common chimpanzees and bonobos split ~2 million years ago (de Waal, 2005), approximately one-third of the time since the human and chimp lineages split.
If humans and pygmy chimpanzees have a purine at a site and gorillas and common chimpanzees
have a pyrimidine, for example, then there must have been two different mutations.
The Gombe National Park provides a dries environment, a smaller food supply and an apparently narrower range of foods than those enjoyed by common chimpanzees
living elsewhere, possibly leading to increased competition for food and decreased body size, they suggest.
however, reported that TTV sequences from pigmy chimpanzees are closely related to viruses from human genotypes 2 and 3, while that sequences obtained from common chimpanzees
were genotypes 5 and 6, the latter only at the protein level.
At around that time, there may have been as many as two million common chimpanzees
spread over most of tropical Africa, in 25 countries from Tanzania in the east to Senegal in the west.
However, they do represent the organizational (and even more important, the aggressive) behavior of common chimpanzees
by giving major credence to the later, rather than the earlier, work of Jane Goodall.
Cameroon, Gabon, and Republic of Congo are home to most Central African common chimpanzees
(Pan troglodytes troglodytes).
The closest parallel today to the pattern of dental development of these ancient, two-legged creatures is not in people but in common chimpanzees
Furthermore, after the recent demonstration of two distinct Rhadinovirus lineages within the common chimpanzees
(7), and based on the known molecular evolution of herpesviruses, our findings of a novel RV2 virus in gibbon may suggest the possible existence of a novel [gamma]-2-herpesvirus in humans, belonging to the RV2 genogroup.
The Stony Brook scientist examined lower-thumb bones of 12 pygmy chimpanzees, 49 common chimpanzees
, and 41 modern humans, as well as single thumb fossils from Australopithecus afarensis (dating to about 3 million years ago), Paranthropus robustus (found at a 1.
Eckhardt and his colleagues found that the Ouranopithecus fossil shares many dental and cranial features with skulls from 280 common chimpanzees
housed in a Frankfurt, Germany colon.
While the ability of common chimpanzees
to understand language is not as clear as some researchers originally contended (SN:5/10/80, p.