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SAVE WESTERN CHIMPANZEES The Western chimpanzee Pan troglodytes verus is a subspecies of chimpanzee that has suffered an 80 percent population decline in the last 25 years as the result of habitat destruction poaching and disease. It is the most at risk of extinction of the four subspecies of chimpanzee. Critically Endangered The Western chimpanzee population has declined by 80 in the last 25 years and the greatest threats to their survival are Unique Behavior Western chimpanzees have unique behaviors never observed in any of the other subspecies of the chimpanzee. In fact their behavior is so diverged from that of their fellow subspecies of chimpanzee that it has been proposed West African chimpanzees may be a distinct species in their own right.