The article analyzes I. Kant’s epistemology criticism on the part of K. Lorenz, a famous ethologist, a Noble prize winner. The peculiar tradition of Austrian philosophy suggests a rejection of Kantian thought, and K. Lorenz, respectively, reconsiders I. Kants ’s ‘a priori’ doctrine critically in terms of modern biology. The scholar insists that philosophical understanding of a man should be funded with current biological knowledge, and he fulfills the potential of the idea in his subsequent works on human perspectives related to the ecological crisis.