The most significant behavioral distinction that can be made between Homo habilis and the australopithecines is the former's:

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The use of stone tools is a significant behavioral distinction between Homo habilis and the australopithecines. While both groups likely used tools, Homo habilis was the first to consistently and intentionally create and use stone tools for a variety of purposes, such as hunting, processing food, and making other tools. Bipedal locomotion is also a significant distinction, but it is not unique to Homo habilis as some australopithecines such as Australopithecus afarensis were also bipedal. Controlled use of fire and use of the wheel are not characteristics of Homo habilis or any other hominin until much later in human evolution.

The Most Significant Behavioral Distinction That Can Be Made Between