Figure 1From: Sperm competition and the evolution of sperm design in mammalsRelation between sperm competition and sperm dimensions in eutherian mammals. Relations between relative testes mass and (A) total sperm length (μm), (B) sperm head length (μm), (C) sperm midpiece length (μm), (D) sperm principal piece length (μm), (E) total sperm flagellum length (μm), and (F) sperm head length/width ratio, among eutherian mammals.Back to article page