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The western chimpanzee or West African chimpanzee [1] (Pan troglodytes verus) is a Critically Endangered subspecies of the common chimpanzee. It inhabits western Africa, specifically Côte d'Ivoire , Guinea , Liberia , Mali , Senegal , Ghana , Guinea-Bissau , but has been extirpated in three countries: Benin , Burkina Faso , and Togo .
Existing chimpanzee populations in West and Central Africa do not overlap with the major human fossil sites in East Africa, but chimpanzee fossils have now been reported from Kenya. This indicates that both humans and members of the Pan clade were present in the East African Rift Valley during the Middle Pleistocene .
Existing chimpanzee populations in West and Central Africa are separate from the major human fossil sites in East Africa; however, chimpanzee fossils have been reported from Kenya, indicating that both humans and members of the Pan clade were present in the East African Rift Valley during the Middle Pleistocene. [31]
A group of chimpanzees grooming. Chimpanzees live in communities of typically 20 to more than 150 members, but spend most of their time traveling in small parties of just a few individuals. The eastern chimpanzee is both arboreal and terrestrial and rests in trees at night, but spends the day on the ground. [5]
The introgressive haplotypes were positively selected in only East Asian populations, rising steadily from 45,000 years ago until a sudden increase of growth rate around 5,000 to 3,500 years ago. They occur at very high frequencies among East Asian populations in contrast to other Eurasian populations (e.g. European and South Asian populations).
The percentage of nucleotides in the human genome (hg38) that had one-to-one exact matches in the chimpanzee genome (pantro6) was 84.38%. Additionally gene trees, generated by comparative analysis of DNA segments, do not always fit the species tree. Summing up: The sequence divergence varies significantly between humans, chimpanzees and gorillas.
The central chimpanzee averages 59.7 kilograms (132 lb) in males and 45.8 kilograms (101 lb) in females. [4] Standing they measure on average 96 cm (38 in) for males and 80 cm (31 in) for females. Central chimpanzees usually have a lifetime in captivity of 30 to 40 years, but some have been seen to live over 50 years. In the wild, the average ...
Few fossil specimens on the "chimpanzee-side" of the split have been found; the first fossil chimpanzee, dating between 545 and 284 kyr (thousand years, radiometric), was discovered in Kenya's East African Rift Valley (McBrearty, 2005). [13] All extinct genera listed in the taxobox [which?] are ancestral to Homo, or are offshoots of such.