Our objective is to contribute to the teaching of Classical Darwinian "Evolution" by means of a study of analogies and metaphors. Throughout the history of knowledge about "Evolution" and in Science teaching, tree structures have been used an analogs to refer to "Evolution," such as by Darwin in the "Tree of Life" passage contained in "On The Origin of Species" (1859). We analyze the analogies and metaphors found in the Darwinian text the "Tree of Life" and propose "Comparative Structural Models of Similarities and Differences" between the "vehicle" and "target," considering the viability of their use in teaching "Sciences." Our foundation is the "Theory of Conceptual Metaphor" by Lakoff and Johnson (1980) and the "Methodology of Teaching with Analogies--MECA"--by Nagem et al. (2001). The analogies and metaphors were classified and analyzed and the similarities and differences were highlighted. We found conceptual metaphors in the text. The analogies and metaphors in the "Tree of Life" are complex and appropriate for didactic use, but require an adequate methodological approach.