What is the least like modern humans?

The species least like modern humans are often considered to be the Neanderthals or other early hominins, such as Australopithecus. While Neanderthals share a common ancestor with modern humans and have similar DNA, they exhibited distinct physical characteristics, behaviors, and cultural practices. In contrast, Australopithecus, which lived millions of years ago, had a more ape-like morphology and different locomotion patterns. These differences highlight the evolutionary divergence between these species and modern Homo sapiens.