Fig. 2From: Subspecific variation in sperm morphology and performance in the Long-tailed Finch (Poephila acuticauda)Relationship between sperm swimming speed (VCL) and the ratio of the lengths of the sperm flagellum and head in the two subspecies of Long-tailed Finch. a P. a. acuticauda, and b P. a. hecki. In b line represents a simple regression line. See main text for full statistical detailsBack to article page