In Flight Behavior, Barbara Kingsolver seemingly polarizes the epistemology employed in investigating why monarch butterflies have happened to aggregate in a small Appalachian community in rural Tennessee; People in the community believe that their territory is blessed by God whereas Dr. Byron, a butterfly scientist, looks for a scientific reasoning. In other words, how to reason one natural phenomenon is dualized into apriorism and scientific experience. Byron asserts that the abnormal migration of monarchs is a freakish biological event caused by climate change while it is a miracle to church-goers in the town. The dualized epistemology is unified in Dellarobia`s vision. Significantly enough, her holistic vision could galvanize ecocriticism or eco-friendly consciousness to the extent that it is on the same track with Deweyan organic metaphysics, because epistemological organity entails no exclusion of otherness. All that Byron has to do a sascientist is measure and count scientific data, and tell what is scientifically true. However, Dellarobia`s organic vision motivates her to do ethical practice toward survival of the monarchs as well as her own new world. Surely, her reciprocal reasoning is expected to enliven pro-environmental voices, which is also needed in today`s environmental politics as well as the relevant literary community.