![]() Chimpanzees and all other nonhuman primates have only the working version in other words, they’re on the powerful, “sprinter” end of the spectrum. People with two working versions of this gene are overrepresented among elite sprinters while those with the nonworking version are overrepresented among endurance runners. These great apes come in all shapes and sizes, but few compare to the largest chimpanzee ever recorded. (Puny jaws have marked our lineage for as least 2 million years.) Many people have also lost another muscle-related gene called ACTN3. Welcome to the world of the Largest Chimpanzee Chimpanzees are fascinating primates known for their intelligence, social behavior, and unique personalities. One gene, for example, called MYH16, contributes to the development of large jaw muscles in other apes. In the past few years, geneticists have identified the loci for some of these anatomical differences. A chimpanzee’s skeletal muscle has longer fibers than the human equivalent and can generate twice the work output over a wider range of motion. Males tend to be larger and more robust than females. But a more important factor seems to be the structure of the muscles themselves. Chimpanzees vary considerably in size and appearance, but they stand approximately 11.7 meters (35.5 feet) tall when erect and weigh about 3260 kg (70130 pounds). How did we get to be the weaklings of the primate order? Our overall body architecture makes a difference: Even though chimpanzees weigh less than humans, more of their mass is concentrated in their powerful arms. But it is a fact that chimpanzees and other apes are stronger than humans. So the figures quoted by primate experts are a little exaggerated. So he packed up a device used to measure pull strength, called a dynamometer, and set out for the Bronx Zoo. Poe’s story of the scalp-pulling orangutan struck Bauman as being “ grotesquely impossible.” In 1923, he noted that every expert in the field believed apes were vastly stronger than humans-yet none had ever tried to prove it. The suspicious claim seems to have originated in a flapper-era study conducted by a biologist named John Bauman. It’s just the sort of factoid the zoo staff might tell you to keep you from knocking on the glass. ![]() If the “five to eight times” figure were true, that would make a large chimpanzee capable of bench-pressing 1 ton. In the wild, males weigh between 34 and 70 kg, whereas females are barely smaller, weighing between 26 and 50 kg. When standing erect, they’re 1 to 1.7 m tall. Adult Nigeria-Cameroon chimpanzees have a head and body size ranging between 635 and 925 mm. Consider that a large human can bench-press 250 pounds. Nigeria-Cameroon chimpanzee Physical Description. But it sounds extreme to suggest that humans are only an eighth as strong as chimpanzees. A chimp on four legs can easily outrun a world-class human sprinter. ![]() Their climbing lifestyle accentuates the need for arm strength. Pulled scalps? Unstuck wagons? No doubt, chimpanzees are different from us. ![]()
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