Knowra Facultative bipedalism Facultative bipedalism Facultative bipedalism is locomotion in which an animal regularly moves on two legs but can also use four-legged movement. It contrasts with obligate bipedalism, in which ordinary locomotion is primarily bipedal.
Bipedal locomotion : Locomotion in which an animal moves using two legs. Facultative bipedalism is one pattern of bipedal locomotion, retaining another mode as well.
Chimpanzee : A great ape native to equatorial Africa, capable of both terrestrial quadrupedalism and occasional bipedal movement. Chimpanzees illustrate brief, task-linked bipedal bouts alongside their usual knuckle-walking.
Obligate bipedalism : A locomotor pattern in which ordinary movement is primarily or exclusively bipedal. It contrasts with facultative bipedalism, which retains regular four-limbed locomotion.
Primate locomotion : The diverse ways primates move, including walking, climbing, leaping, and suspension. Facultative bipedalism is one part of the broader locomotor repertoire studied in primates.
Quadrupedalism : Locomotion in which an animal moves using four limbs. It is the alternative gait available when a facultatively bipedal animal returns to four-limbed movement.
Bonobo : A great ape found south of the Congo River, able to walk bipedally as well as move on all fours. Bonobos use upright walking in some social and foraging contexts without relying on it for ordinary travel.
Knuckle-walking : A form of quadrupedal locomotion in which an animal bears weight on the knuckles of its forelimbs. This is the characteristic ground gait of chimpanzees and gorillas, often contrasted with their upright bouts.
Human evolution : The evolutionary history of humans and their ancestors. Facultative bipedalism helps frame comparisons between ape locomotion and the emergence of habitual human walking.
Center of mass : The point at which a body's mass can be treated as concentrated for analyzing motion. Keeping the center of mass over a small support area is a central balance challenge in bipedal steps.
Gorilla : A large African ape that usually travels on all fours but can stand and walk bipedally. Gorillas demonstrate how carrying, display, or feeding can accompany short upright walks.
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