Figure 2.

Relations between sperm velocity, sperm size and sperm competition in eutherian mammals. Relations between (A) sperm straight-line swimming velocity (μm/s) and total sperm length (μm), and (B) sperm straight line swimming velocity and relative testes mass, in 26 species of eutherian mammals.

Tourmente et al. BMC Evolutionary Biology 2011 11:12   doi:10.1186/1471-2148-11-12
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