As a fundamental concept for distinguishing humans from or associating them with animals,instinct is more challenging to comprehend than it appears.Once found its place within Darwin's theory of evolution,instinct has undergone a lengthy process of conceptual evolution,traversing between φ(υ)σι(ς),instinctus,instinctu naturae,Trieb,and behavior.In current discussions concerning life and animals,the necessity and complexity of the instinct concept are once again highlighted,reflecting its ebb and flow in the protracted debate about the relationship between humanity and animality.The essence of instinct remains undecided,and its journey of conceptual evolution is far from concluded.As we meander through the aforementioned concepts,we may discover that discussions surrounding instinct have formed a gravitational field pervaded by the"Western philosophy's anthropological machine,"and instinct can be seen as a"Grenzbegriff"produced by this machine.