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Relaxed penis length (filled symbols) and corresponding manually inflated penis length (open symbols) of barnacles from an exposed shore (Prasiola Point; squares, solid lines) and a protected shore (Grappler Inlet; circles, dashed lines) in Barkley Sound, BC, Canada. Paired points represent individual barnacles and arrows denote transition from relaxed to inflated penis length (mean proportional inflation±s.e.m.: protected shore=1.82±0.082; exposed shore=1.75±0.044; p=0.77).
