The large brain is often considered a hallmark of modern humans and our hominid ancestors; however, it is not one of the characteristics thought to be obligate when discussing hominids.An obligate behavior of hominids is

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Bipedal locomotion, or walking on two legs, is considered an obligate behavior of hominids because it is a defining characteristic that distinguishes them from other primates. It is also thought to have played a significant role in the evolution of other hominid characteristics, such as larger brains and changes to the pelvis and spine. A larger brain, on the other hand, is not considered obligate as some extinct hominids had smaller brains than modern humans but still exhibited other characteristics associated with hominids. Speech and honing chewing are behaviors and traits associated with hominids but are not considered obligate. Material culture is also associated with hominids but is not considered obligate as not all hominids necessarily possessed or utilized it.

The Large Brain Is Often Considered a Hallmark of Modern